diff --git a/erpnext/__version__.py b/erpnext/__version__.py
index 1d96984..4220bc7 100644
--- a/erpnext/__version__.py
+++ b/erpnext/__version__.py
@@ -1,2 +1,2 @@
 from __future__ import unicode_literals
-__version__ = '6.12.1'
+__version__ = '6.12.2'
diff --git a/erpnext/buying/doctype/purchase_order/purchase_order.py b/erpnext/buying/doctype/purchase_order/purchase_order.py
index af14400..feb144d 100644
--- a/erpnext/buying/doctype/purchase_order/purchase_order.py
+++ b/erpnext/buying/doctype/purchase_order/purchase_order.py
@@ -8,7 +8,6 @@
 from frappe import msgprint, _, throw
 from frappe.model.mapper import get_mapped_doc
 from erpnext.controllers.buying_controller import BuyingController
-from erpnext.stock.doctype.item.item import get_last_purchase_details
 from erpnext.stock.stock_balance import update_bin_qty, get_ordered_qty
 from frappe.desk.notifications import clear_doctype_notifications
 
@@ -282,7 +281,7 @@
 				"parenttype": "prevdoc_doctype",
 			},
 			"postprocess": update_item,
-			"condition": lambda doc: doc.received_qty < doc.qty and doc.delivered_by_supplier!=1
+			"condition": lambda doc: abs(doc.received_qty) < abs(doc.qty) and doc.delivered_by_supplier!=1
 		},
 		"Purchase Taxes and Charges": {
 			"doctype": "Purchase Taxes and Charges",
@@ -318,7 +317,7 @@
 				"parent": "purchase_order",
 			},
 			"postprocess": update_item,
-			"condition": lambda doc: (doc.base_amount==0 or doc.billed_amt < doc.amount)
+			"condition": lambda doc: (doc.base_amount==0 or abs(doc.billed_amt) < abs(doc.amount))
 		},
 		"Purchase Taxes and Charges": {
 			"doctype": "Purchase Taxes and Charges",
diff --git a/erpnext/hooks.py b/erpnext/hooks.py
index f4d24d8..bb68978 100644
--- a/erpnext/hooks.py
+++ b/erpnext/hooks.py
@@ -7,7 +7,7 @@
 app_description = """ERP made simple"""
 app_icon = "icon-th"
 app_color = "#e74c3c"
-app_version = "6.12.1"
+app_version = "6.12.2"
 app_email = "info@erpnext.com"
 app_license = "GNU General Public License (v3)"
 source_link = "https://github.com/frappe/erpnext"
diff --git a/erpnext/hr/doctype/salary_slip/salary_slip.py b/erpnext/hr/doctype/salary_slip/salary_slip.py
index 88d1402..ea7c96e 100644
--- a/erpnext/hr/doctype/salary_slip/salary_slip.py
+++ b/erpnext/hr/doctype/salary_slip/salary_slip.py
@@ -29,10 +29,15 @@
 
 	def check_sal_struct(self):
 		m = get_month_details(self.fiscal_year, self.month)
+		
+		joining_date, relieving_date = frappe.db.get_value("Employee", self.employee, 
+			["date_of_joining", "relieving_date"])
+		
 		struct = frappe.db.sql("""select name from `tabSalary Structure`
 			where employee=%s and is_active = 'Yes'
-			and from_date <= %s and (to_date is null or to_date >= %s)""",
-			(self.employee, m.month_start_date, m.month_end_date))
+			and (from_date <= %s or from_date <= %s) 
+			and (to_date is null or to_date >= %s or to_date >= %s)""",
+			(self.employee, m.month_start_date, joining_date, m.month_end_date, relieving_date))
 
 		if not struct:
 			msgprint(_("No active Salary Structure found for employee {0} and the month")
diff --git a/erpnext/selling/doctype/sales_order/sales_order.py b/erpnext/selling/doctype/sales_order/sales_order.py
index d2b1653..66ca31e 100644
--- a/erpnext/selling/doctype/sales_order/sales_order.py
+++ b/erpnext/selling/doctype/sales_order/sales_order.py
@@ -384,7 +384,7 @@
 				"parent": "against_sales_order",
 			},
 			"postprocess": update_item,
-			"condition": lambda doc: doc.delivered_qty < doc.qty and doc.delivered_by_supplier!=1
+			"condition": lambda doc: abs(doc.delivered_qty) < abs(doc.qty) and doc.delivered_by_supplier!=1
 		},
 		"Sales Taxes and Charges": {
 			"doctype": "Sales Taxes and Charges",
@@ -430,7 +430,7 @@
 				"parent": "sales_order",
 			},
 			"postprocess": update_item,
-			"condition": lambda doc: doc.qty and (doc.base_amount==0 or doc.billed_amt < doc.amount)
+			"condition": lambda doc: doc.qty and (doc.base_amount==0 or abs(doc.billed_amt) < abs(doc.amount))
 		},
 		"Sales Taxes and Charges": {
 			"doctype": "Sales Taxes and Charges",
diff --git a/erpnext/stock/doctype/delivery_note/delivery_note.py b/erpnext/stock/doctype/delivery_note/delivery_note.py
index fd3742e..c5fd34f 100644
--- a/erpnext/stock/doctype/delivery_note/delivery_note.py
+++ b/erpnext/stock/doctype/delivery_note/delivery_note.py
@@ -332,7 +332,7 @@
 				"serial_no": "serial_no"
 			},
 			"postprocess": update_item,
-			"filter": lambda d: d.qty - invoiced_qty_map.get(d.name, 0)<=0
+			"filter": lambda d: abs(d.qty) - abs(invoiced_qty_map.get(d.name, 0))<=0
 		},
 		"Sales Taxes and Charges": {
 			"doctype": "Sales Taxes and Charges",
diff --git a/erpnext/stock/doctype/item/item.py b/erpnext/stock/doctype/item/item.py
index b11603e..dfd281a 100644
--- a/erpnext/stock/doctype/item/item.py
+++ b/erpnext/stock/doctype/item/item.py
@@ -378,6 +378,13 @@
 			if not (self.is_purchase_item or self.is_pro_applicable):
 				frappe.throw(_("""To set reorder level, item must be a Purchase Item or Manufacturing Item"""))
 
+		if self.re_order_level and not self.re_order_qty:
+			frappe.throw(_("Please set reorder quantity"))
+		for d in self.get("reorder_levels"):
+			if d.warehouse_reorder_level and not d.warehouse_reorder_qty:
+				frappe.throw(_("Row #{0}: Please set reorder quantity").format(d.idx))
+					
+
 	def validate_warehouse_for_reorder(self):
 		warehouse = []
 		for i in self.get("reorder_levels"):
diff --git a/erpnext/stock/doctype/purchase_receipt/purchase_receipt.py b/erpnext/stock/doctype/purchase_receipt/purchase_receipt.py
index a640e6e..b20617e 100644
--- a/erpnext/stock/doctype/purchase_receipt/purchase_receipt.py
+++ b/erpnext/stock/doctype/purchase_receipt/purchase_receipt.py
@@ -469,7 +469,7 @@
 				"prevdoc_docname": "purchase_order",
 			},
 			"postprocess": update_item,
-			"filter": lambda d: d.qty - invoiced_qty_map.get(d.name, 0)<=0
+			"filter": lambda d: abs(d.qty) - abs(invoiced_qty_map.get(d.name, 0))<=0
 		},
 		"Purchase Taxes and Charges": {
 			"doctype": "Purchase Taxes and Charges",
diff --git a/setup.py b/setup.py
index 8ef1565..ffaee6b 100644
--- a/setup.py
+++ b/setup.py
@@ -1,6 +1,6 @@
 from setuptools import setup, find_packages
 
-version = "6.12.1"
+version = "6.12.2"
 
 with open("requirements.txt", "r") as f:
 	install_requires = f.readlines()