diff --git a/erpnext/__init__.py b/erpnext/__init__.py
index fa3fcc2..405274a 100644
--- a/erpnext/__init__.py
+++ b/erpnext/__init__.py
@@ -4,7 +4,7 @@
 import frappe
 from erpnext.hooks import regional_overrides
 
-__version__ = '9.0.4'
+__version__ = '9.0.6'
 
 def get_default_company(user=None):
 	'''Get default company for user'''
diff --git a/erpnext/accounts/doctype/journal_entry/journal_entry.py b/erpnext/accounts/doctype/journal_entry/journal_entry.py
index f7e4023..b553a42 100644
--- a/erpnext/accounts/doctype/journal_entry/journal_entry.py
+++ b/erpnext/accounts/doctype/journal_entry/journal_entry.py
@@ -12,8 +12,8 @@
 from erpnext.hr.doctype.employee_loan.employee_loan import update_disbursement_status
 
 class JournalEntry(AccountsController):
-	def __init__(self, arg1, arg2=None):
-		super(JournalEntry, self).__init__(arg1, arg2)
+	def __init__(self, *args, **kwargs):
+		super(JournalEntry, self).__init__(*args, **kwargs)
 
 	def get_feed(self):
 		return self.voucher_type
diff --git a/erpnext/accounts/doctype/purchase_invoice/purchase_invoice.py b/erpnext/accounts/doctype/purchase_invoice/purchase_invoice.py
index a564d92..c12aa50 100644
--- a/erpnext/accounts/doctype/purchase_invoice/purchase_invoice.py
+++ b/erpnext/accounts/doctype/purchase_invoice/purchase_invoice.py
@@ -22,8 +22,8 @@
 }
 
 class PurchaseInvoice(BuyingController):
-	def __init__(self, arg1, arg2=None):
-		super(PurchaseInvoice, self).__init__(arg1, arg2)
+	def __init__(self, *args, **kwargs):
+		super(PurchaseInvoice, self).__init__(*args, **kwargs)
 		self.status_updater = [{
 			'source_dt': 'Purchase Invoice Item',
 			'target_dt': 'Purchase Order Item',
diff --git a/erpnext/accounts/doctype/sales_invoice/pos.py b/erpnext/accounts/doctype/sales_invoice/pos.py
index 2b3459a..dd10977 100644
--- a/erpnext/accounts/doctype/sales_invoice/pos.py
+++ b/erpnext/accounts/doctype/sales_invoice/pos.py
@@ -417,6 +417,7 @@
 				'link_doctype': 'Customer',
 				'link_name': customer
 			})
+		doc.flags.ignore_mandatory = True
 		doc.save(ignore_permissions=True)
 
 def make_address(args, customer):
@@ -441,6 +442,7 @@
 	address.is_primary_address = 1
 	address.is_shipping_address = 1
 	address.update(args)
+	address.flags.ignore_mandatory = True
 	address.save(ignore_permissions = True)
 
 def make_email_queue(email_queue):
diff --git a/erpnext/accounts/doctype/sales_invoice/sales_invoice.py b/erpnext/accounts/doctype/sales_invoice/sales_invoice.py
index 678988d..515ca64 100644
--- a/erpnext/accounts/doctype/sales_invoice/sales_invoice.py
+++ b/erpnext/accounts/doctype/sales_invoice/sales_invoice.py
@@ -27,8 +27,8 @@
 }
 
 class SalesInvoice(SellingController):
-	def __init__(self, arg1, arg2=None):
-		super(SalesInvoice, self).__init__(arg1, arg2)
+	def __init__(self, *args, **kwargs):
+		super(SalesInvoice, self).__init__(*args, **kwargs)
 		self.status_updater = [{
 			'source_dt': 'Sales Invoice Item',
 			'target_field': 'billed_amt',
diff --git a/erpnext/accounts/page/pos/pos.js b/erpnext/accounts/page/pos/pos.js
index be0b6f7..57a8a18 100644
--- a/erpnext/accounts/page/pos/pos.js
+++ b/erpnext/accounts/page/pos/pos.js
@@ -113,6 +113,7 @@
 		});
 
 		this.page.add_menu_item(__("Sync Offline Invoices"), function () {
+			me.freeze_screen = true;
 			me.sync_sales_invoice()
 		});
 
@@ -1684,6 +1685,7 @@
 	set_interval_for_si_sync: function () {
 		var me = this;
 		setInterval(function () {
+			me.freeze_screen = false;
 			me.sync_sales_invoice()
 		}, 60000)
 	},
@@ -1697,9 +1699,12 @@
 			this.freeze = this.customer_doc.display
 		}
 
+		freeze_screen = this.freeze_screen || false;
+
 		if ((this.si_docs.length || this.email_queue_list || this.customers_list) && !this.freeze) {
 			frappe.call({
 				method: "erpnext.accounts.doctype.sales_invoice.pos.make_invoice",
+				freeze: freeze_screen,
 				args: {
 					doc_list: me.si_docs,
 					email_queue_list: me.email_queue_list,
diff --git a/erpnext/accounts/party.py b/erpnext/accounts/party.py
index b86561b..6bb6dc1 100644
--- a/erpnext/accounts/party.py
+++ b/erpnext/accounts/party.py
@@ -69,7 +69,8 @@
 	billing_address_field = "customer_address" if party_type == "Lead" \
 		else party_type.lower() + "_address"
 	out[billing_address_field] = get_default_address(party_type, party.name)
-	out.update(get_fetch_values(doctype, billing_address_field, out[billing_address_field]))
+	if doctype:
+		out.update(get_fetch_values(doctype, billing_address_field, out[billing_address_field]))
 
 	# address display
 	out.address_display = get_address_display(out[billing_address_field])
@@ -78,7 +79,8 @@
 	if party_type in ["Customer", "Lead"]:
 		out.shipping_address_name = get_default_address(party_type, party.name, 'is_shipping_address')
 		out.shipping_address = get_address_display(out["shipping_address_name"])
-		out.update(get_fetch_values(doctype, 'shipping_address_name', out.shipping_address_name))
+		if doctype:
+			out.update(get_fetch_values(doctype, 'shipping_address_name', out.shipping_address_name))
 
 	if doctype and doctype in ['Delivery Note', 'Sales Invoice']:
 		out.update(get_company_address(company))
diff --git a/erpnext/buying/doctype/purchase_order/purchase_order.py b/erpnext/buying/doctype/purchase_order/purchase_order.py
index e2f5a9d..36cef43 100644
--- a/erpnext/buying/doctype/purchase_order/purchase_order.py
+++ b/erpnext/buying/doctype/purchase_order/purchase_order.py
@@ -20,8 +20,8 @@
 }
 
 class PurchaseOrder(BuyingController):
-	def __init__(self, arg1, arg2=None):
-		super(PurchaseOrder, self).__init__(arg1, arg2)
+	def __init__(self, *args, **kwargs):
+		super(PurchaseOrder, self).__init__(*args, **kwargs)
 		self.status_updater = [{
 			'source_dt': 'Purchase Order Item',
 			'target_dt': 'Material Request Item',
diff --git a/erpnext/controllers/accounts_controller.py b/erpnext/controllers/accounts_controller.py
index 9719c22..c538f79 100644
--- a/erpnext/controllers/accounts_controller.py
+++ b/erpnext/controllers/accounts_controller.py
@@ -15,8 +15,8 @@
 force_item_fields = ("item_group", "barcode", "brand", "stock_uom")
 
 class AccountsController(TransactionBase):
-	def __init__(self, arg1, arg2=None):
-		super(AccountsController, self).__init__(arg1, arg2)
+	def __init__(self, *args, **kwargs):
+		super(AccountsController, self).__init__(*args, **kwargs)
 
 	@property
 	def company_currency(self):
@@ -213,9 +213,6 @@
 								if stock_qty != len(get_serial_nos(item.get('serial_no'))):
 									item.set(fieldname, value)
 
-							elif fieldname == "conversion_factor" and not item.get("conversion_factor"):
-								item.set(fieldname, value)
-
 					if ret.get("pricing_rule"):
 						# if user changed the discount percentage then set user's discount percentage ?
 						item.set("discount_percentage", ret.get("discount_percentage"))
diff --git a/erpnext/controllers/buying_controller.py b/erpnext/controllers/buying_controller.py
index 9cc0616..1f9051d 100644
--- a/erpnext/controllers/buying_controller.py
+++ b/erpnext/controllers/buying_controller.py
@@ -61,7 +61,7 @@
 
 		# set contact and address details for supplier, if they are not mentioned
 		if getattr(self, "supplier", None):
-			self.update_if_missing(get_party_details(self.supplier, party_type="Supplier", ignore_permissions=self.flags.ignore_permissions))
+			self.update_if_missing(get_party_details(self.supplier, party_type="Supplier", ignore_permissions=self.flags.ignore_permissions, doctype=self.doctype, company=self.company))
 
 		self.set_missing_item_details(for_validate)
 
diff --git a/erpnext/controllers/selling_controller.py b/erpnext/controllers/selling_controller.py
index d881f18..c1028a5 100644
--- a/erpnext/controllers/selling_controller.py
+++ b/erpnext/controllers/selling_controller.py
@@ -49,7 +49,8 @@
 		if getattr(self, "customer", None):
 			from erpnext.accounts.party import _get_party_details
 			party_details = _get_party_details(self.customer,
-				ignore_permissions=self.flags.ignore_permissions)
+				ignore_permissions=self.flags.ignore_permissions,
+				doctype=self.doctype, company=self.company)
 			if not self.meta.get_field("sales_team"):
 				party_details.pop("sales_team")
 
diff --git a/erpnext/crm/doctype/opportunity/opportunity.py b/erpnext/crm/doctype/opportunity/opportunity.py
index 4251cae..970fd57 100644
--- a/erpnext/crm/doctype/opportunity/opportunity.py
+++ b/erpnext/crm/doctype/opportunity/opportunity.py
@@ -42,10 +42,28 @@
 		if not self.with_items:
 			self.items = []
 
-
 	def make_new_lead_if_required(self):
 		"""Set lead against new opportunity"""
 		if not (self.lead or self.customer) and self.contact_email:
+			# check if customer is already created agains the self.contact_email
+			customer = frappe.db.sql("""select
+				distinct `tabDynamic Link`.link_name as customer
+				from 
+					`tabContact`,
+					`tabDynamic Link`
+				where `tabContact`.email_id='{0}'
+				and 
+					`tabContact`.name=`tabDynamic Link`.parent
+				and
+					ifnull(`tabDynamic Link`.link_name, '')<>'' 
+				and 
+					`tabDynamic Link`.link_doctype='Customer' 
+			""".format(self.contact_email), as_dict=True)
+			if customer and customer[0].customer:
+				self.customer = customer[0].customer
+				self.enquiry_from = "Customer"
+				return
+
 			lead_name = frappe.db.get_value("Lead", {"email_id": self.contact_email})
 			if not lead_name:
 				sender_name = get_fullname(self.contact_email)
diff --git a/erpnext/crm/doctype/opportunity/test_opportunity.py b/erpnext/crm/doctype/opportunity/test_opportunity.py
index 4cd20ea..61b583c 100644
--- a/erpnext/crm/doctype/opportunity/test_opportunity.py
+++ b/erpnext/crm/doctype/opportunity/test_opportunity.py
@@ -4,6 +4,7 @@
 
 import frappe
 from frappe.utils import today
+from erpnext.crm.doctype.lead.lead import make_customer
 from erpnext.crm.doctype.opportunity.opportunity import make_quotation
 import unittest
 
@@ -25,12 +26,45 @@
 		doc = frappe.get_doc('Opportunity', doc.name)
 		self.assertEquals(doc.status, "Quotation")
 
+	def test_make_new_lead_if_required(self):
+		args = {
+			"doctype": "Opportunity",
+			"contact_email":"new.opportunity@example.com",
+			"enquiry_type": "Sales",
+			"with_items": 0,
+			"transaction_date": today()
+		}
+		# new lead should be created against the new.opportunity@example.com
+		opp_doc = frappe.get_doc(args).insert(ignore_permissions=True)
+
+		self.assertTrue(opp_doc.lead)
+		self.assertEquals(opp_doc.enquiry_from, "Lead")
+		self.assertEquals(frappe.db.get_value("Lead", opp_doc.lead, "email_id"),
+			'new.opportunity@example.com')
+
+		# create new customer and create new contact against 'new.opportunity@example.com'
+		customer = make_customer(opp_doc.lead).insert(ignore_permissions=True)
+		frappe.get_doc({
+			"doctype": "Contact",
+			"email_id": "new.opportunity@example.com",
+			"first_name": "_Test Opportunity Customer",
+			"links": [{
+				"link_doctype": "Customer",
+				"link_name": customer.name
+			}]
+		}).insert(ignore_permissions=True)
+
+		opp_doc = frappe.get_doc(args).insert(ignore_permissions=True)
+		self.assertTrue(opp_doc.customer)
+		self.assertEquals(opp_doc.enquiry_from, "Customer")
+		self.assertEquals(opp_doc.customer, customer.name)
+
 def make_opportunity(**args):
 	args = frappe._dict(args)
 
 	opp_doc = frappe.get_doc({
 		"doctype": "Opportunity",
-		"enquiry_from": "Customer" or args.enquiry_from,
+		"enquiry_from": args.enquiry_from or "Customer",
 		"enquiry_type": "Sales",
 		"with_items": args.with_items or 0,
 		"transaction_date": today()
diff --git a/erpnext/hooks.py b/erpnext/hooks.py
index 48ed741..6d411cd 100644
--- a/erpnext/hooks.py
+++ b/erpnext/hooks.py
@@ -11,7 +11,7 @@
 app_license = "GNU General Public License (v3)"
 source_link = "https://github.com/frappe/erpnext"
 
-develop_version = '8.x.x-beta'
+develop_version = '9.x.x-develop'
 
 error_report_email = "support@erpnext.com"
 
diff --git a/erpnext/manufacturing/doctype/production_planning_tool/production_planning_tool.py b/erpnext/manufacturing/doctype/production_planning_tool/production_planning_tool.py
index 815e504..1d57a2f 100644
--- a/erpnext/manufacturing/doctype/production_planning_tool/production_planning_tool.py
+++ b/erpnext/manufacturing/doctype/production_planning_tool/production_planning_tool.py
@@ -12,10 +12,6 @@
 from erpnext.manufacturing.doctype.production_order.production_order import get_item_details
 
 class ProductionPlanningTool(Document):
-	def __init__(self, arg1, arg2=None):
-		super(ProductionPlanningTool, self).__init__(arg1, arg2)
-		self.item_dict = {}
-
 	def clear_table(self, table_name):
 		self.set(table_name, [])
 
@@ -398,6 +394,9 @@
 		return bom_wise_item_details
 
 	def make_items_dict(self, item_list):
+		if not getattr(self, "item_dict", None):
+			self.item_dict = {}
+
 		for i in item_list:
 			self.item_dict.setdefault(i[0], []).append([flt(i[1]), i[2], i[3], i[4], i[5]])
 
diff --git a/erpnext/public/js/controllers/transaction.js b/erpnext/public/js/controllers/transaction.js
index 8055877..8421c47 100644
--- a/erpnext/public/js/controllers/transaction.js
+++ b/erpnext/public/js/controllers/transaction.js
@@ -101,27 +101,6 @@
 				return me.set_query_for_batch(doc, cdt, cdn)
 			});
 		}
-	},
-	onload: function() {
-		var me = this;
-		if(this.frm.doc.__islocal) {
-			var today = frappe.datetime.get_today(),
-				currency = frappe.defaults.get_user_default("currency");
-
-			$.each({
-				currency: currency,
-				price_list_currency: currency,
-				status: "Draft",
-				is_subcontracted: "No",
-			}, function(fieldname, value) {
-				if(me.frm.fields_dict[fieldname] && !me.frm.doc[fieldname])
-					me.frm.set_value(fieldname, value);
-			});
-
-			if(this.frm.doc.company && !this.frm.doc.amended_from) {
-				this.frm.trigger("company");
-			}
-		}
 
 		if(this.frm.fields_dict["payment_terms_template"]){
 			this.frm.trigger("payment_terms_template");
@@ -157,11 +136,36 @@
 
 				return {
 					filters: filters
-				}
+				};
 			});
 		}
+	},
+	onload: function() {
+		var me = this;
 
 		this.setup_quality_inspection();
+
+		if(this.frm.doc.__islocal) {
+			var currency = frappe.defaults.get_user_default("currency");
+
+			let set_value = (fieldname, value) => {
+				if(me.frm.fields_dict[fieldname] && !me.frm.doc[fieldname]) {
+					return me.frm.set_value(fieldname, value);
+				}
+			};
+
+			return frappe.run_serially([
+				() => set_value('currency', currency),
+				() => set_value('price_list_currency', currency),
+				() => set_value('status', 'Draft'),
+				() => set_value('is_subcontracted', 'No'),
+				() => {
+					if(this.frm.doc.company && !this.frm.doc.amended_from) {
+						this.frm.trigger("company");
+					}
+				}
+			]);
+		}
 	},
 
 	setup_quality_inspection: function() {
@@ -199,13 +203,12 @@
 	},
 
 	onload_post_render: function() {
-		var me = this;
 		if(this.frm.doc.__islocal && !(this.frm.doc.taxes || []).length
 			&& !(this.frm.doc.__onload ? this.frm.doc.__onload.load_after_mapping : false)) {
-			this.apply_default_taxes();
+			frappe.after_ajax(() => this.apply_default_taxes());
 		} else if(this.frm.doc.__islocal && this.frm.doc.company && this.frm.doc["items"]
 			&& !this.frm.doc.is_pos) {
-			me.calculate_taxes_and_totals();
+			frappe.after_ajax(() => this.calculate_taxes_and_totals());
 		}
 		if(frappe.meta.get_docfield(this.frm.doc.doctype + " Item", "item_code")) {
 			this.setup_item_selector();
@@ -383,7 +386,7 @@
 				var company_currency = me.get_company_currency();
 				var company_doc = frappe.get_doc(":Company", me.frm.doc.company);
 
-				if (!me.frm.doc.currency || me.frm.doc.currency != company_currency) {
+				if (!me.frm.doc.currency) {
 					me.frm.set_value("currency", company_currency);
 				}
 
diff --git a/erpnext/public/js/setup_wizard.js b/erpnext/public/js/setup_wizard.js
index 88178f4..7c274f1 100644
--- a/erpnext/public/js/setup_wizard.js
+++ b/erpnext/public/js/setup_wizard.js
@@ -86,6 +86,10 @@
 			});
 		},
 		validate: function() {
+			if ((this.values.company_name || "").toLowerCase() == "company") {
+				frappe.msgprint(__("Company Name cannot be Company"));
+				return false;
+			}
 			if (!this.values.company_abbr) {
 				return false;
 			}
@@ -135,10 +139,6 @@
 				frappe.msgprint(__("Please enter valid Financial Year Start and End Dates"));
 				return false;
 			}
-			if ((this.values.company_name || "").toLowerCase() == "company") {
-				frappe.msgprint(__("Company Name cannot be Company"));
-				return false;
-			}
 			return true;
 		},
 
diff --git a/erpnext/public/js/utils/serial_no_batch_selector.js b/erpnext/public/js/utils/serial_no_batch_selector.js
index 3e2414e..69e3d2f 100644
--- a/erpnext/public/js/utils/serial_no_batch_selector.js
+++ b/erpnext/public/js/utils/serial_no_batch_selector.js
@@ -96,7 +96,17 @@
 
 		if(this.show_dialog) {
 			let d = this.item;
-			this.dialog.set_value('serial_no', d.serial_no);
+			if (d.has_serial_no && d.serial_no) {
+				this.dialog.set_value('serial_no', d.serial_no);
+			} else if (d.batch_no) {
+				this.dialog.fields_dict.batches.df.data.push({
+					'batch_no': d.batch_no,
+					'actual_qty': d.actual_qty,
+					'selected_qty': d.qty
+				});
+
+				this.dialog.fields_dict.batches.grid.refresh();
+			}
 		}
 
 		this.dialog.show();
@@ -116,8 +126,10 @@
 			}
 			values.batches.map((batch, i) => {
 				if(!batch.selected_qty || batch.selected_qty === 0 ) {
-					frappe.throw(__("Please select quantity on row " + (i+1)));
-					return false;
+					if (!this.show_dialog) {
+						frappe.throw(__("Please select quantity on row " + (i+1)));
+						return false;
+					}
 				}
 			});
 			return true;
@@ -125,9 +137,11 @@
 		} else {
 			let serial_nos = values.serial_no || '';
 			if (!serial_nos || !serial_nos.replace(/\s/g, '').length) {
-				frappe.throw(__("Please enter serial numbers for serialized item "
-					+ values.item_code));
-				return false;
+				if (!this.show_dialog) {
+					frappe.throw(__("Please enter serial numbers for serialized item "
+						+ values.item_code));
+					return false;
+				}
 			}
 			return true;
 		}
diff --git a/erpnext/schools/doctype/student_applicant/student_applicant.py b/erpnext/schools/doctype/student_applicant/student_applicant.py
index 081fa06..aeeffce 100644
--- a/erpnext/schools/doctype/student_applicant/student_applicant.py
+++ b/erpnext/schools/doctype/student_applicant/student_applicant.py
@@ -13,7 +13,6 @@
 		if self.student_admission:
 			naming_series = frappe.db.get_value('Student Admission', self.student_admission,
 				'naming_series_for_student_applicant')
-			print(naming_series)
 
 			if naming_series:
 				self.naming_series = naming_series
diff --git a/erpnext/selling/doctype/installation_note/installation_note.py b/erpnext/selling/doctype/installation_note/installation_note.py
index 720247d..9f730f4 100644
--- a/erpnext/selling/doctype/installation_note/installation_note.py
+++ b/erpnext/selling/doctype/installation_note/installation_note.py
@@ -12,8 +12,8 @@
 from erpnext.utilities.transaction_base import TransactionBase
 
 class InstallationNote(TransactionBase):
-	def __init__(self, arg1, arg2=None):
-		super(InstallationNote, self).__init__(arg1, arg2)
+	def __init__(self, *args, **kwargs):
+		super(InstallationNote, self).__init__(*args, **kwargs)
 		self.status_updater = [{
 			'source_dt': 'Installation Note Item',
 			'target_dt': 'Delivery Note Item',
diff --git a/erpnext/selling/doctype/quotation/quotation.py b/erpnext/selling/doctype/quotation/quotation.py
index 1cdd840..f0cce5f 100644
--- a/erpnext/selling/doctype/quotation/quotation.py
+++ b/erpnext/selling/doctype/quotation/quotation.py
@@ -32,7 +32,7 @@
 		self.validate_valid_till()
 		if self.items:
 			self.with_items = 1
-
+			
 	def validate_valid_till(self):
 		if self.valid_till and self.valid_till < self.transaction_date:
 			frappe.throw(_("Valid till date cannot be before transaction date"))
@@ -79,15 +79,10 @@
 		else:
 			frappe.throw(_("Cannot set as Lost as Sales Order is made."))
 
-	def check_item_table(self):
-		if not self.get('items'):
-			frappe.throw(_("Please enter item details"))
-
 	def on_submit(self):
-		self.check_item_table()
-
 		# Check for Approving Authority
-		frappe.get_doc('Authorization Control').validate_approving_authority(self.doctype, self.company, self.base_grand_total, self)
+		frappe.get_doc('Authorization Control').validate_approving_authority(self.doctype,
+			self.company, self.base_grand_total, self)
 
 		#update enquiry status
 		self.update_opportunity()
diff --git a/erpnext/selling/doctype/sales_order/sales_order.py b/erpnext/selling/doctype/sales_order/sales_order.py
index 8720482..98333c4 100644
--- a/erpnext/selling/doctype/sales_order/sales_order.py
+++ b/erpnext/selling/doctype/sales_order/sales_order.py
@@ -22,8 +22,8 @@
 class WarehouseRequired(frappe.ValidationError): pass
 
 class SalesOrder(SellingController):
-	def __init__(self, arg1, arg2=None):
-		super(SalesOrder, self).__init__(arg1, arg2)
+	def __init__(self, *args, **kwargs):
+		super(SalesOrder, self).__init__(*args, **kwargs)
 
 	def validate(self):
 		super(SalesOrder, self).validate()
@@ -696,7 +696,8 @@
 				"contact_display",
 				"contact_mobile",
 				"contact_email",
-				"contact_person"
+				"contact_person",
+				"taxes_and_charges"
 			],
 			"validation": {
 				"docstatus": ["=", 1]
diff --git a/erpnext/selling/page/point_of_sale/point_of_sale.js b/erpnext/selling/page/point_of_sale/point_of_sale.js
index 1b67ff2..f9045b5 100644
--- a/erpnext/selling/page/point_of_sale/point_of_sale.js
+++ b/erpnext/selling/page/point_of_sale/point_of_sale.js
@@ -89,6 +89,7 @@
 		this.cart = new POSCart({
 			frm: this.frm,
 			wrapper: this.wrapper.find('.cart-container'),
+			pos_profile: this.pos_profile,
 			events: {
 				on_customer_change: (customer) => this.frm.set_value('customer', customer),
 				on_field_change: (item_code, field, value) => {
@@ -196,6 +197,7 @@
 			this.update_item_in_frm(item)
 				.then(() => {
 					// update cart
+					this.remove_item_from_cart(item);
 					this.update_cart_data(item);
 				});
 		}, true);
@@ -215,12 +217,18 @@
 		return this.frm.script_manager
 			.trigger('qty', item.doctype, item.name)
 			.then(() => {
-				if (field === 'qty' && value === 0) {
-					frappe.model.clear_doc(item.doctype, item.name);
+				if (field === 'qty') {
+					this.remove_item_from_cart(item);
 				}
 			});
 	}
 
+	remove_item_from_cart(item) {
+		if (item.qty === 0) {
+			frappe.model.clear_doc(item.doctype, item.name);
+		}
+	}
+
 	make_payment_modal() {
 		this.payment = new Payment({
 			frm: this.frm,
@@ -363,10 +371,11 @@
 };
 
 class POSCart {
-	constructor({frm, wrapper, events}) {
+	constructor({frm, wrapper, pos_profile, events}) {
 		this.frm = frm;
 		this.wrapper = wrapper;
 		this.events = events;
+		this.pos_profile = pos_profile;
 		this.make();
 		this.bind_events();
 	}
@@ -514,6 +523,7 @@
 	}
 
 	make_customer_field() {
+		let customer = this.frm.doc.customer || this.pos_profile['customer'];
 		this.customer_field = frappe.ui.form.make_control({
 			df: {
 				fieldtype: 'Link',
@@ -521,7 +531,6 @@
 				fieldname: 'customer',
 				options: 'Customer',
 				reqd: 1,
-				default: this.frm.doc.customer,
 				onchange: () => {
 					this.events.on_customer_change(this.customer_field.get_value());
 				}
@@ -529,6 +538,10 @@
 			parent: this.wrapper.find('.customer-field'),
 			render_input: true
 		});
+
+		if (customer) {
+			this.customer_field.set_value(customer);
+		}
 	}
 
 	make_numpad() {
@@ -919,7 +932,7 @@
 				}
 				if(batch_no) {
 					this.events.update_cart(items[0].item_code,
-						'batch_no', serial_no);
+						'batch_no', batch_no);
 					this.search_field.set_value('');
 				}
 			});
diff --git a/erpnext/setup/doctype/email_digest/email_digest.py b/erpnext/setup/doctype/email_digest/email_digest.py
index c85a541..8d1fb3d 100644
--- a/erpnext/setup/doctype/email_digest/email_digest.py
+++ b/erpnext/setup/doctype/email_digest/email_digest.py
@@ -16,14 +16,13 @@
 
 from frappe.model.document import Document
 class EmailDigest(Document):
-	def __init__(self, arg1, arg2=None):
-		super(EmailDigest, self).__init__(arg1, arg2)
+	def __init__(self, *args, **kwargs):
+		super(EmailDigest, self).__init__(*args, **kwargs)
 
 		self.from_date, self.to_date = self.get_from_to_date()
 		self.set_dates()
 		self._accounts = {}
-		self.currency = frappe.db.get_value("Company", self.company,
-			"default_currency")
+		self.currency = frappe.db.get_value("Company", self.company, "default_currency")
 
 	def get_users(self):
 		"""get list of users"""
diff --git a/erpnext/setup/setup_wizard/healthcare.py b/erpnext/setup/setup_wizard/healthcare.py
index ebc644e..43a0237 100644
--- a/erpnext/setup/setup_wizard/healthcare.py
+++ b/erpnext/setup/setup_wizard/healthcare.py
@@ -191,21 +191,21 @@
 def create_lab_test_items():
 	records = [
 		{"doctype": "Item", "item_code": "MCH", "item_name": "MCH", "item_group": "Laboratory",
-			"stock_uom": "Unit", "is_stock_item": 0, "is_purchase_item": 0, "is_sales_item": 1},
+			"stock_uom": _("Unit"), "is_stock_item": 0, "is_purchase_item": 0, "is_sales_item": 1},
 		{"doctype": "Item", "item_code": "LDL", "item_name": "LDL", "item_group": "Laboratory",
-			"stock_uom": "Unit", "is_stock_item": 0, "is_purchase_item": 0, "is_sales_item": 1},
+			"stock_uom": _("Unit"), "is_stock_item": 0, "is_purchase_item": 0, "is_sales_item": 1},
 		{"doctype": "Item", "item_code": "GTT", "item_name": "GTT", "item_group": "Laboratory",
-			"stock_uom": "Unit", "is_stock_item": 0, "is_purchase_item": 0, "is_sales_item": 1},
+			"stock_uom": _("Unit"), "is_stock_item": 0, "is_purchase_item": 0, "is_sales_item": 1},
 		{"doctype": "Item", "item_code": "HDL", "item_name": "HDL", "item_group": "Laboratory",
-			"stock_uom": "Unit", "is_stock_item": 0, "is_purchase_item": 0, "is_sales_item": 1},
+			"stock_uom": _("Unit"), "is_stock_item": 0, "is_purchase_item": 0, "is_sales_item": 1},
 		{"doctype": "Item", "item_code": "BILT", "item_name": "BILT", "item_group": "Laboratory",
-			"stock_uom": "Unit", "is_stock_item": 0, "is_purchase_item": 0, "is_sales_item": 1},
+			"stock_uom": _("Unit"), "is_stock_item": 0, "is_purchase_item": 0, "is_sales_item": 1},
 		{"doctype": "Item", "item_code": "BILD", "item_name": "BILD", "item_group": "Laboratory",
-			"stock_uom": "Unit", "is_stock_item": 0, "is_purchase_item": 0, "is_sales_item": 1},
+			"stock_uom": _("Unit"), "is_stock_item": 0, "is_purchase_item": 0, "is_sales_item": 1},
 		{"doctype": "Item", "item_code": "BP", "item_name": "BP", "item_group": "Laboratory",
-			"stock_uom": "Unit", "is_stock_item": 0, "is_purchase_item": 0, "is_sales_item": 1},
+			"stock_uom": _("Unit"), "is_stock_item": 0, "is_purchase_item": 0, "is_sales_item": 1},
 		{"doctype": "Item", "item_code": "BS", "item_name": "BS", "item_group": "Laboratory",
-			"stock_uom": "Unit", "is_stock_item": 0, "is_purchase_item": 0, "is_sales_item": 1}
+			"stock_uom": _("Unit"), "is_stock_item": 0, "is_purchase_item": 0, "is_sales_item": 1}
 	]
 	insert_record(records)
 
diff --git a/erpnext/stock/doctype/delivery_note/delivery_note.py b/erpnext/stock/doctype/delivery_note/delivery_note.py
index f5a99af..dd00398 100644
--- a/erpnext/stock/doctype/delivery_note/delivery_note.py
+++ b/erpnext/stock/doctype/delivery_note/delivery_note.py
@@ -21,8 +21,8 @@
 }
 
 class DeliveryNote(SellingController):
-	def __init__(self, arg1, arg2=None):
-		super(DeliveryNote, self).__init__(arg1, arg2)
+	def __init__(self, *args, **kwargs):
+		super(DeliveryNote, self).__init__(*args, **kwargs)
 		self.status_updater = [{
 			'source_dt': 'Delivery Note Item',
 			'target_dt': 'Sales Order Item',
diff --git a/erpnext/stock/doctype/purchase_receipt/purchase_receipt.py b/erpnext/stock/doctype/purchase_receipt/purchase_receipt.py
index 2d089c4..e49f993 100644
--- a/erpnext/stock/doctype/purchase_receipt/purchase_receipt.py
+++ b/erpnext/stock/doctype/purchase_receipt/purchase_receipt.py
@@ -19,8 +19,8 @@
 }
 
 class PurchaseReceipt(BuyingController):
-	def __init__(self, arg1, arg2=None):
-		super(PurchaseReceipt, self).__init__(arg1, arg2)
+	def __init__(self, *args, **kwargs):
+		super(PurchaseReceipt, self).__init__(*args, **kwargs)
 		self.status_updater = [{
 			'source_dt': 'Purchase Receipt Item',
 			'target_dt': 'Purchase Order Item',
diff --git a/erpnext/stock/doctype/serial_no/serial_no.py b/erpnext/stock/doctype/serial_no/serial_no.py
index c39efa0..80c93ef 100644
--- a/erpnext/stock/doctype/serial_no/serial_no.py
+++ b/erpnext/stock/doctype/serial_no/serial_no.py
@@ -20,8 +20,8 @@
 class SerialNoDuplicateError(ValidationError): pass
 
 class SerialNo(StockController):
-	def __init__(self, arg1, arg2=None):
-		super(SerialNo, self).__init__(arg1, arg2)
+	def __init__(self, *args, **kwargs):
+		super(SerialNo, self).__init__(*args, **kwargs)
 		self.via_stock_ledger = False
 
 	def validate(self):
diff --git a/erpnext/stock/doctype/stock_reconciliation/stock_reconciliation.py b/erpnext/stock/doctype/stock_reconciliation/stock_reconciliation.py
index 360ebca..0f91e43 100644
--- a/erpnext/stock/doctype/stock_reconciliation/stock_reconciliation.py
+++ b/erpnext/stock/doctype/stock_reconciliation/stock_reconciliation.py
@@ -14,8 +14,8 @@
 class EmptyStockReconciliationItemsError(frappe.ValidationError): pass
 
 class StockReconciliation(StockController):
-	def __init__(self, arg1, arg2=None):
-		super(StockReconciliation, self).__init__(arg1, arg2)
+	def __init__(self, *args, **kwargs):
+		super(StockReconciliation, self).__init__(*args, **kwargs)
 		self.head_row = ["Item Code", "Warehouse", "Quantity", "Valuation Rate"]
 
 	def validate(self):
diff --git a/erpnext/stock/get_item_details.py b/erpnext/stock/get_item_details.py
index 0b92c25..539e8a5 100644
--- a/erpnext/stock/get_item_details.py
+++ b/erpnext/stock/get_item_details.py
@@ -165,14 +165,13 @@
 	warehouse = user_default_warehouse or item.default_warehouse or args.warehouse
 
 	#Set the UOM to the Default Sales UOM or Default Purchase UOM if configured in the Item Master
-	if args.get('doctype') in ['Quotation', 'Sales Order', 'Delivery Note', 'Sales Invoice']:
-		uom = item.sales_uom if item.sales_uom else item.stock_uom
-	elif args.get('doctype') in ['Purchase Order', 'Purchase Receipt', 'Purchase Invoice']:
-		uom = item.purchase_uom if item.purchase_uom else item.stock_uom
-	else:
-		uom = item.stock_uom
-
-	args.uom = uom
+	if not args.uom:
+		if args.get('doctype') in ['Quotation', 'Sales Order', 'Delivery Note', 'Sales Invoice']:
+			args.uom = item.sales_uom if item.sales_uom else item.stock_uom
+		elif args.get('doctype') in ['Purchase Order', 'Purchase Receipt', 'Purchase Invoice']:
+			args.uom = item.purchase_uom if item.purchase_uom else item.stock_uom
+		else:
+			args.uom = item.stock_uom
 
 	out = frappe._dict({
 		"item_code": item.name,
@@ -188,7 +187,7 @@
 		"batch_no": None,
 		"item_tax_rate": json.dumps(dict(([d.tax_type, d.tax_rate] for d in
 			item.get("taxes")))),
-		"uom": uom,
+		"uom": args.uom,
 		"min_order_qty": flt(item.min_order_qty) if args.doctype == "Material Request" else "",
 		"qty": args.qty or 1.0,
 		"stock_qty": args.qty or 1.0,