fix: reset incoming rate in selling controller if there are changes in item

(cherry picked from commit 2d6b43f)

Author: mihir-kandoi

erpnext/controllers/selling_controller.py

@@ -533,13 +533,16 @@ def set_incoming_rate(self):
 		if self.doctype not in ("Delivery Note", "Sales Invoice"):
 			return
 
+		from erpnext.stock.serial_batch_bundle import get_batch_nos
+
 		allow_at_arms_length_price = frappe.get_cached_value(
 			"Stock Settings", None, "allow_internal_transfer_at_arms_length_price"
 		)
 		set_zero_rate_for_expired_batch = frappe.db.get_single_value(
 			"Selling Settings", "set_zero_rate_for_expired_batch"
 		)
 
+		old_doc = self.get_doc_before_save()
 		items = self.get("items") + (self.get("packed_items") or [])
 		for d in items:
 			if not frappe.get_cached_value("Item", d.item_code, "is_stock_item"):
@@ -569,6 +572,29 @@ def set_incoming_rate(self):
 				# Get incoming rate based on original item cost based on valuation method
 				qty = flt(d.get("stock_qty") or d.get("actual_qty") or d.get("qty"))
 
+				if old_doc:
+					old_item = next(
+						(
+							item
+							for item in (old_doc.get("items") + (old_doc.get("packed_items") or []))
+							if item.name == d.name
+						),
+						None,
+					)
+					if old_item:
+						old_qty = flt(
+							old_item.get("stock_qty") or old_item.get("actual_qty") or old_item.get("qty")
+						)
+						if (
+							old_item.item_code != d.item_code
+							or old_item.warehouse != d.warehouse
+							or old_qty != qty
+							or old_item.batch_no != d.batch_no
+							or get_batch_nos(old_item.serial_and_batch_bundle)
+							!= get_batch_nos(d.serial_and_batch_bundle)
+						):
+							d.incoming_rate = 0
+
 				if (
 					not d.incoming_rate
 					or self.is_internal_transfer()