fix: throw if item order field is not set in subcontracting controller

(cherry picked from commit d256365)

Author: ljain112

erpnext/controllers/subcontracting_controller.py

@@ -166,29 +166,46 @@ def validate_items(self):
 						_("Row {0}: Item {1} must be a subcontracted item.").format(item.idx, item.item_name)
 					)
 
-				if self.doctype != "Subcontracting Receipt" and item.qty > flt(
-					get_pending_subcontracted_quantity(
-						self.doctype,
-						self.purchase_order if self.doctype == "Subcontracting Order" else self.sales_order,
-					).get(
-						item.purchase_order_item
-						if self.doctype == "Subcontracting Order"
-						else item.sales_order_item
-					)
-					/ item.subcontracting_conversion_factor,
-					frappe.get_precision(
+				if self.doctype != "Subcontracting Receipt":
+					order_item_doctype = (
 						"Purchase Order Item"
 						if self.doctype == "Subcontracting Order"
-						else "Sales Order Item",
-						"qty",
-					),
-				):
-					frappe.throw(
-						_(
-							"Row {0}: Item {1}'s quantity cannot be higher than the available quantity."
-						).format(item.idx, item.item_name)
+						else "Sales Order Item"
+					)
+
+					order_name = (
+						self.purchase_order if self.doctype == "Subcontracting Order" else self.sales_order
+					)
+					order_item_field = frappe.scrub(order_item_doctype)
+
+					if not item.get(order_item_field):
+						frappe.throw(
+							_("Row {0}: Item {1} must be linked to a {2}.").format(
+								item.idx, item.item_name, order_item_doctype
+							)
+						)
+
+					pending_qty = flt(
+						flt(
+							get_pending_subcontracted_quantity(
+								order_item_doctype,
+								order_name,
+							).get(item.get(order_item_field))
+						)
+						/ item.subcontracting_conversion_factor,
+						frappe.get_precision(
+							order_item_doctype,
+							"qty",
+						),
 					)
 
+					if item.qty > pending_qty:
+						frappe.throw(
+							_(
+								"Row {0}: Item {1}'s quantity cannot be higher than the available quantity."
+							).format(item.idx, item.item_name)
+						)
+
 				if self.doctype != "Subcontracting Inward Order":
 					item.amount = item.qty * item.rate
 
@@ -1333,9 +1350,7 @@ def get_item_details(items):
 
 
 def get_pending_subcontracted_quantity(doctype, name):
-	table = frappe.qb.DocType(
-		"Purchase Order Item" if doctype == "Subcontracting Order" else "Sales Order Item"
-	)
+	table = frappe.qb.DocType(doctype)
 	query = (
 		frappe.qb.from_(table)
 		.select(table.name, table.stock_qty, table.subcontracted_qty)