Error in Opening Invoice creation Tool (#11938) (#11941)

* add qty field

* cast qty to float

* PEP8 compliance
diff --git a/erpnext/accounts/doctype/opening_invoice_creation_tool/opening_invoice_creation_tool.py b/erpnext/accounts/doctype/opening_invoice_creation_tool/opening_invoice_creation_tool.py
index 8bd1554..f173376 100644
--- a/erpnext/accounts/doctype/opening_invoice_creation_tool/opening_invoice_creation_tool.py
+++ b/erpnext/accounts/doctype/opening_invoice_creation_tool/opening_invoice_creation_tool.py
@@ -8,6 +8,7 @@
 from frappe.utils import flt
 from frappe.model.document import Document
 
+
 class OpeningInvoiceCreationTool(Document):
 	def onload(self):
 		"""Load the Opening Invoice summary"""
@@ -70,7 +71,7 @@
 			if not row.party:
 				frappe.throw(mandatory_error_msg.format(
 					idx=row.idx,
-					field= _("Party"),
+					field=_("Party"),
 					invoice_type=self.invoice_type
 				))
 			# set party type if not available
@@ -80,14 +81,14 @@
 			if not row.posting_date:
 				frappe.throw(mandatory_error_msg.format(
 					idx=row.idx,
-					field= _("Party"),
+					field=_("Party"),
 					invoice_type=self.invoice_type
 				))
 
 			if not row.outstanding_amount:
 				frappe.throw(mandatory_error_msg.format(
 					idx=row.idx,
-					field= _("Outstanding Amount"),
+					field=_("Outstanding Amount"),
 					invoice_type=self.invoice_type
 				))
 
@@ -99,10 +100,14 @@
 			doc.submit()
 			names.append(doc.name)
 
-			if(len(self.invoices) > 5):
-				frappe.publish_realtime("progress",
-					dict(progress=[row.idx, len(self.invoices)], title=_('Creating {0}').format(doc.doctype)),
-					user=frappe.session.user)
+			if len(self.invoices) > 5:
+				frappe.publish_realtime(
+					"progress", dict(
+						progress=[row.idx, len(self.invoices)],
+						title=_('Creating {0}').format(doc.doctype)
+					),
+					user=frappe.session.user
+				)
 
 		return names
 
@@ -111,8 +116,10 @@
 			default_uom = frappe.db.get_single_value("Stock Settings", "stock_uom") or _("Nos")
 			cost_center = frappe.db.get_value("Company", self.company, "cost_center")
 			if not cost_center:
-				frappe.throw(_("Please set the Default Cost Center in {0} company").format(frappe.bold(self.company)))
-			rate = flt(row.outstanding_amount) / row.qty
+				frappe.throw(
+					_("Please set the Default Cost Center in {0} company").format(frappe.bold(self.company))
+				)
+			rate = flt(row.outstanding_amount) / flt(row.qty)
 
 			return frappe._dict({
 				"uom": default_uom,
@@ -143,8 +150,7 @@
 			"due_date": row.due_date,
 			"posting_date": row.posting_date,
 			frappe.scrub(party_type): row.party,
-			"doctype": "Sales Invoice" if self.invoice_type == "Sales" \
-				else "Purchase Invoice",
+			"doctype": "Sales Invoice" if self.invoice_type == "Sales" else "Purchase Invoice",
 			"currency": frappe.db.get_value("Company", self.company, "default_currency")
 		})
 
@@ -160,4 +166,4 @@
 	if not accounts:
 		frappe.throw(_("Please add a Temporary Opening account in Chart of Accounts"))
 
-	return accounts[0].name
\ No newline at end of file
+	return accounts[0].name
diff --git a/erpnext/accounts/doctype/opening_invoice_creation_tool_item/opening_invoice_creation_tool_item.json b/erpnext/accounts/doctype/opening_invoice_creation_tool_item/opening_invoice_creation_tool_item.json
index ef0bfae..3f8ce16 100644
--- a/erpnext/accounts/doctype/opening_invoice_creation_tool_item/opening_invoice_creation_tool_item.json
+++ b/erpnext/accounts/doctype/opening_invoice_creation_tool_item/opening_invoice_creation_tool_item.json
@@ -288,6 +288,66 @@
    "search_index": 0, 
    "set_only_once": 0, 
    "unique": 0
+  }, 
+  {
+   "allow_bulk_edit": 0, 
+   "allow_on_submit": 0, 
+   "bold": 0, 
+   "collapsible": 0, 
+   "columns": 0, 
+   "fieldname": "column_break_4", 
+   "fieldtype": "Column Break", 
+   "hidden": 0, 
+   "ignore_user_permissions": 0, 
+   "ignore_xss_filter": 0, 
+   "in_filter": 0, 
+   "in_global_search": 0, 
+   "in_list_view": 0, 
+   "in_standard_filter": 0, 
+   "length": 0, 
+   "no_copy": 0, 
+   "permlevel": 0, 
+   "precision": "", 
+   "print_hide": 0, 
+   "print_hide_if_no_value": 0, 
+   "read_only": 0, 
+   "remember_last_selected_value": 0, 
+   "report_hide": 0, 
+   "reqd": 0, 
+   "search_index": 0, 
+   "set_only_once": 0, 
+   "unique": 0
+  }, 
+  {
+   "allow_bulk_edit": 0, 
+   "allow_on_submit": 0, 
+   "bold": 0, 
+   "collapsible": 0, 
+   "columns": 0, 
+   "default": "1", 
+   "fieldname": "qty", 
+   "fieldtype": "Data", 
+   "hidden": 0, 
+   "ignore_user_permissions": 0, 
+   "ignore_xss_filter": 0, 
+   "in_filter": 0, 
+   "in_global_search": 0, 
+   "in_list_view": 0, 
+   "in_standard_filter": 0, 
+   "label": "Quantity", 
+   "length": 0, 
+   "no_copy": 0, 
+   "permlevel": 0, 
+   "precision": "", 
+   "print_hide": 0, 
+   "print_hide_if_no_value": 0, 
+   "read_only": 0, 
+   "remember_last_selected_value": 0, 
+   "report_hide": 0, 
+   "reqd": 0, 
+   "search_index": 0, 
+   "set_only_once": 0, 
+   "unique": 0
   }
  ], 
  "has_web_view": 0, 
@@ -300,7 +360,7 @@
  "issingle": 0, 
  "istable": 1, 
  "max_attachments": 0, 
- "modified": "2017-11-15 14:19:00.433148", 
+ "modified": "2017-12-11 17:49:14.541176", 
  "modified_by": "Administrator", 
  "module": "Accounts", 
  "name": "Opening Invoice Creation Tool Item",