diff --git a/erpnext/controllers/buying_controller.py b/erpnext/controllers/buying_controller.py
index e05c70e..7fab538 100644
--- a/erpnext/controllers/buying_controller.py
+++ b/erpnext/controllers/buying_controller.py
@@ -331,7 +331,7 @@
 
 				if raw_material.batch_nos:
 					batches_qty = get_batches_with_qty(raw_material.rm_item_code, raw_material.main_item_code,
-						qty, transferred_batch_qty_map, backflushed_batch_qty_map)
+						qty, transferred_batch_qty_map, backflushed_batch_qty_map, item.purchase_order)
 					for batch_data in batches_qty:
 						qty = batch_data['qty']
 						raw_material.batch_no = batch_data['batch']
@@ -343,6 +343,9 @@
 		rm = self.append('supplied_items', {})
 		rm.update(raw_material_data)
 
+		if not rm.main_item_code:
+			rm.main_item_code = fg_item_doc.item_code
+
 		rm.required_qty = qty
 		rm.consumed_qty = qty
 
@@ -873,7 +876,7 @@
 			AND se.purpose='Send to Subcontractor'
 			AND se.purchase_order = %s
 			AND IFNULL(sed.t_warehouse, '') != ''
-			AND sed.subcontracted_item = %s
+			AND IFNULL(sed.subcontracted_item, '') in ('', %s)
 		GROUP BY sed.item_code, sed.subcontracted_item
 	"""
 	raw_materials = frappe.db.multisql({
@@ -1004,14 +1007,15 @@
 		SELECT
 			sed.batch_no,
 			SUM(sed.qty) AS qty,
-			sed.item_code
+			sed.item_code,
+			sed.subcontracted_item
 		FROM `tabStock Entry` se,`tabStock Entry Detail` sed
 		WHERE
 			se.name = sed.parent
 			AND se.docstatus=1
 			AND se.purpose='Send to Subcontractor'
 			AND se.purchase_order = %s
-			AND sed.subcontracted_item = %s
+			AND ifnull(sed.subcontracted_item, '') in ('', %s)
 			AND sed.batch_no IS NOT NULL
 		GROUP BY
 			sed.batch_no,
@@ -1019,8 +1023,10 @@
 	""", (purchase_order, fg_item), as_dict=1)
 
 	for batch_data in transferred_batches:
-		transferred_batch_qty_map.setdefault((batch_data.item_code, fg_item), {})
-		transferred_batch_qty_map[(batch_data.item_code, fg_item)][batch_data.batch_no] = batch_data.qty
+		key = ((batch_data.item_code, fg_item)
+			if batch_data.subcontracted_item else (batch_data.item_code, purchase_order))
+		transferred_batch_qty_map.setdefault(key, {})
+		transferred_batch_qty_map[key][batch_data.batch_no] = batch_data.qty
 
 	return transferred_batch_qty_map
 
@@ -1057,9 +1063,12 @@
 
 	return backflushed_batch_qty_map
 
-def get_batches_with_qty(item_code, fg_item, required_qty, transferred_batch_qty_map, backflushed_batch_qty_map):
+def get_batches_with_qty(item_code, fg_item, required_qty, transferred_batch_qty_map, backflushed_batch_qty_map, po):
 	# Returns available batches to be backflushed based on requirements
 	transferred_batches = transferred_batch_qty_map.get((item_code, fg_item), {})
+	if not transferred_batches:
+		transferred_batches = transferred_batch_qty_map.get((item_code, po), {})
+
 	backflushed_batches = backflushed_batch_qty_map.get((item_code, fg_item), {})
 
 	available_batches = []
diff --git a/erpnext/stock/doctype/purchase_receipt/test_purchase_receipt.py b/erpnext/stock/doctype/purchase_receipt/test_purchase_receipt.py
index 12c8906..c5f3034 100644
--- a/erpnext/stock/doctype/purchase_receipt/test_purchase_receipt.py
+++ b/erpnext/stock/doctype/purchase_receipt/test_purchase_receipt.py
@@ -717,6 +717,66 @@
 		# Allowed to submit for other company's PR
 		self.assertEqual(pr.docstatus, 1)
 
+	def test_subcontracted_pr_for_multi_transfer_batches(self):
+		from erpnext.stock.doctype.stock_entry.test_stock_entry import make_stock_entry
+		from erpnext.buying.doctype.purchase_order.purchase_order import make_rm_stock_entry, make_purchase_receipt
+		from erpnext.buying.doctype.purchase_order.test_purchase_order import (update_backflush_based_on,
+			create_purchase_order)
+
+		update_backflush_based_on("Material Transferred for Subcontract")
+		item_code = "_Test Subcontracted FG Item 3"
+
+		make_item('Sub Contracted Raw Material 3', {
+			'is_stock_item': 1,
+			'is_sub_contracted_item': 1,
+			'has_batch_no': 1,
+			'create_new_batch': 1
+		})
+
+		create_subcontracted_item(item_code=item_code, has_batch_no=1,
+			raw_materials=["Sub Contracted Raw Material 3"])
+
+		order_qty = 500
+		po = create_purchase_order(item_code=item_code, qty=order_qty,
+			is_subcontracted="Yes", supplier_warehouse="_Test Warehouse 1 - _TC")
+
+		ste1=make_stock_entry(target="_Test Warehouse - _TC",
+			item_code = "Sub Contracted Raw Material 3", qty=300, basic_rate=100)
+		ste2=make_stock_entry(target="_Test Warehouse - _TC",
+			item_code = "Sub Contracted Raw Material 3", qty=200, basic_rate=100)
+
+		transferred_batch = {
+			ste1.items[0].batch_no : 300,
+			ste2.items[0].batch_no : 200
+		}
+
+		rm_items = [
+			{"item_code":item_code,"rm_item_code":"Sub Contracted Raw Material 3","item_name":"_Test Item",
+				"qty":300,"warehouse":"_Test Warehouse - _TC", "stock_uom":"Nos"},
+			{"item_code":item_code,"rm_item_code":"Sub Contracted Raw Material 3","item_name":"_Test Item",
+				"qty":200,"warehouse":"_Test Warehouse - _TC", "stock_uom":"Nos"}
+		]
+
+		rm_item_string = json.dumps(rm_items)
+		se = frappe.get_doc(make_rm_stock_entry(po.name, rm_item_string))
+		self.assertEqual(len(se.items), 2)
+		se.items[0].batch_no = ste1.items[0].batch_no
+		se.items[1].batch_no = ste2.items[0].batch_no
+		se.submit()
+
+		supplied_qty = frappe.db.get_value("Purchase Order Item Supplied",
+			{"parent": po.name, "rm_item_code": "Sub Contracted Raw Material 3"}, "supplied_qty")
+
+		self.assertEqual(supplied_qty, 500.00)
+
+		pr = make_purchase_receipt(po.name)
+		pr.save()
+		self.assertEqual(len(pr.supplied_items), 2)
+
+		for row in pr.supplied_items:
+			self.assertEqual(transferred_batch.get(row.batch_no), row.consumed_qty)
+
+		update_backflush_based_on("BOM")
 
 def get_sl_entries(voucher_type, voucher_no):
 	return frappe.db.sql(""" select actual_qty, warehouse, stock_value_difference
@@ -858,6 +918,33 @@
 			pr.submit()
 	return pr
 
+def create_subcontracted_item(**args):
+	from erpnext.manufacturing.doctype.production_plan.test_production_plan import make_bom
+
+	args = frappe._dict(args)
+
+	if not frappe.db.exists('Item', args.item_code):
+		make_item(args.item_code, {
+			'is_stock_item': 1,
+			'is_sub_contracted_item': 1,
+			'has_batch_no': args.get("has_batch_no") or 0
+		})
+
+	if not args.raw_materials:
+		if not frappe.db.exists('Item', "Test Extra Item 1"):
+			make_item("Test Extra Item 1", {
+				'is_stock_item': 1,
+			})
+
+		if not frappe.db.exists('Item', "Test Extra Item 2"):
+			make_item("Test Extra Item 2", {
+				'is_stock_item': 1,
+			})
+
+		args.raw_materials = ['_Test FG Item', 'Test Extra Item 1']
+
+	if not frappe.db.get_value('BOM', {'item': args.item_code}, 'name'):
+		make_bom(item = args.item_code, raw_materials = args.get("raw_materials"))
 
 test_dependencies = ["BOM", "Item Price", "Location"]
 test_records = frappe.get_test_records('Purchase Receipt')
diff --git a/erpnext/stock/doctype/stock_entry/stock_entry.py b/erpnext/stock/doctype/stock_entry/stock_entry.py
index 9ad3694..54e70d4 100644
--- a/erpnext/stock/doctype/stock_entry/stock_entry.py
+++ b/erpnext/stock/doctype/stock_entry/stock_entry.py
@@ -571,8 +571,9 @@
 		qty_allowance = flt(frappe.db.get_single_value("Buying Settings",
 			"over_transfer_allowance"))
 
-		if (self.purpose == "Send to Subcontractor" and self.purchase_order and
-			backflush_raw_materials_based_on == 'BOM'):
+		if not (self.purpose == "Send to Subcontractor" and self.purchase_order): return
+
+		if (backflush_raw_materials_based_on == 'BOM'):
 			purchase_order = frappe.get_doc("Purchase Order", self.purchase_order)
 			for se_item in self.items:
 				item_code = se_item.original_item or se_item.item_code
@@ -609,6 +610,11 @@
 				if flt(total_supplied, precision) > flt(total_allowed, precision):
 					frappe.throw(_("Row {0}# Item {1} cannot be transferred more than {2} against Purchase Order {3}")
 						.format(se_item.idx, se_item.item_code, total_allowed, self.purchase_order))
+		elif backflush_raw_materials_based_on == "Material Transferred for Subcontract":
+			for row in self.items:
+				if not row.subcontracted_item:
+					frappe.throw(_("Row {0}: Subcontracted Item is mandatory for the raw material {1}")
+						.format(row.idx, frappe.bold(row.item_code)))
 
 	def validate_bom(self):
 		for d in self.get('items'):
@@ -817,6 +823,13 @@
 			ret.get('has_batch_no') and not args.get('batch_no')):
 			args.batch_no = get_batch_no(args['item_code'], args['s_warehouse'], args['qty'])
 
+		if self.purpose == "Send to Subcontractor" and self.get("purchase_order") and args.get('item_code'):
+			subcontract_items = frappe.get_all("Purchase Order Item Supplied",
+				{"parent": self.purchase_order, "rm_item_code": args.get('item_code')}, "main_item_code")
+
+			if subcontract_items and len(subcontract_items) == 1:
+				ret["subcontracted_item"] = subcontract_items[0].main_item_code
+
 		return ret
 
 	def set_items_for_stock_in(self):
@@ -1288,9 +1301,15 @@
 		#Update Supplied Qty in PO Supplied Items
 
 		frappe.db.sql("""UPDATE `tabPurchase Order Item Supplied` pos
-			SET pos.supplied_qty = (SELECT ifnull(sum(transfer_qty), 0) FROM `tabStock Entry Detail` sed
-			WHERE pos.name = sed.po_detail and sed.docstatus = 1)
-			WHERE pos.docstatus = 1 and pos.parent = %s""", self.purchase_order)
+			SET
+				pos.supplied_qty = IFNULL((SELECT ifnull(sum(transfer_qty), 0)
+					FROM
+						`tabStock Entry Detail` sed, `tabStock Entry` se
+					WHERE
+						(pos.name = sed.po_detail OR sed.subcontracted_item = pos.main_item_code)
+						AND sed.docstatus = 1 AND se.name = sed.parent and se.purchase_order = %(po)s
+				), 0)
+			WHERE pos.docstatus = 1 and pos.parent = %(po)s""", {"po": self.purchase_order})
 
 		#Update reserved sub contracted quantity in bin based on Supplied Item Details and
 		for d in self.get("items"):
diff --git a/erpnext/stock/doctype/stock_entry_detail/stock_entry_detail.json b/erpnext/stock/doctype/stock_entry_detail/stock_entry_detail.json
index ae2e3a1..79e8f9a 100644
--- a/erpnext/stock/doctype/stock_entry_detail/stock_entry_detail.json
+++ b/erpnext/stock/doctype/stock_entry_detail/stock_entry_detail.json
@@ -1,5 +1,4 @@
 {
- "actions": [],
  "autoname": "hash",
  "creation": "2013-03-29 18:22:12",
  "doctype": "DocType",
@@ -16,6 +15,7 @@
   "item_code",
   "col_break2",
   "item_name",
+  "subcontracted_item",
   "section_break_8",
   "description",
   "column_break_10",
@@ -57,7 +57,6 @@
   "material_request",
   "material_request_item",
   "original_item",
-  "subcontracted_item",
   "reference_section",
   "against_stock_entry",
   "ste_detail",
@@ -415,6 +414,7 @@
    "read_only": 1
   },
   {
+   "depends_on": "eval:parent.purpose == 'Send to Subcontractor'",
    "fieldname": "subcontracted_item",
    "fieldtype": "Link",
    "label": "Subcontracted Item",
@@ -504,7 +504,7 @@
  "index_web_pages_for_search": 1,
  "istable": 1,
  "links": [],
- "modified": "2020-09-22 17:55:03.384138",
+ "modified": "2020-09-23 17:55:03.384138",
  "modified_by": "Administrator",
  "module": "Stock",
  "name": "Stock Entry Detail",