[BUG] Map Production Order with the exact Sales Order line item

erpnext/manufacturing/doctype/production_order/production_order.json

@@ -1314,6 +1314,36 @@
    "set_only_once": 0, 
    "unique": 0
   }, 
+  {
+   "allow_bulk_edit": 0, 
+   "allow_on_submit": 0, 
+   "bold": 0, 
+   "collapsible": 0, 
+   "columns": 0, 
+   "fieldname": "sales_order_item", 
+   "fieldtype": "Data", 
+   "hidden": 1, 
+   "ignore_user_permissions": 0, 
+   "ignore_xss_filter": 0, 
+   "in_filter": 0, 
+   "in_global_search": 0, 
+   "in_list_view": 0, 
+   "in_standard_filter": 0, 
+   "label": "Sales Order Item", 
+   "length": 0, 
+   "no_copy": 0, 
+   "permlevel": 0, 
+   "precision": "", 
+   "print_hide": 0, 
+   "print_hide_if_no_value": 0, 
+   "read_only": 1, 
+   "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, 
@@ -1358,7 +1388,7 @@
  "issingle": 0, 
  "istable": 0, 
  "max_attachments": 0, 
- "modified": "2017-07-10 14:29:00.457874", 
+ "modified": "2017-09-15 11:34:10.018611", 
  "modified_by": "Administrator", 
  "module": "Manufacturing", 
  "name": "Production Order", 

erpnext/selling/doctype/sales_order/sales_order.js

@@ -213,6 +213,8 @@ erpnext.selling.SalesOrderController = erpnext.selling.SellingController.extend(
 									}},
 								{fieldtype:'Float', fieldname:'pending_qty', reqd: 1,
 									label: __('Qty'), in_list_view:1},
+								{fieldtype:'Data', fieldname:'sales_order_item', reqd: 1,
+									label: __('Sales Order Item'), hidden:1}
 							],
 							get_data: function() {
 								return r.message

erpnext/selling/doctype/sales_order/sales_order.py

@@ -337,13 +337,14 @@ class SalesOrder(SellingController):
 				if bom:
 					stock_qty = i.qty if i.doctype == 'Packed Item' else i.stock_qty
 					pending_qty= stock_qty - flt(frappe.db.sql('''select sum(qty) from `tabProduction Order`
-							where production_item=%s and sales_order=%s and docstatus<2''', (i.item_code, self.name))[0][0])
+							where production_item=%s and sales_order=%s and sales_order_item = %s and docstatus<2''', (i.item_code, self.name, i.name))[0][0])
 					if pending_qty:
 						items.append(dict(
 							item_code= i.item_code,
 							bom = bom,
 							warehouse = i.warehouse,
-							pending_qty = pending_qty
+							pending_qty = pending_qty,
+							sales_order_item = i.name
 						))
 		return items
 
@@ -768,6 +769,7 @@ def make_production_orders(items, sales_order, company, project=None):
 			qty=i['pending_qty'],
 			company=company,
 			sales_order=sales_order,
+			sales_order_item=i['sales_order_item'],
 			project=project,
 			fg_warehouse=i['warehouse']
 		)).insert()