fix: test for raising MR-SE mismatch error

- Make test add mismatched item code instead of warehouse, since warehouse can be different.

erpnext/stock/doctype/material_request/test_material_request.py

@@ -427,6 +427,7 @@ class TestMaterialRequest(unittest.TestCase):
 			"basic_rate": 1.0
 		})
 		se_doc.get("items")[1].update({
+			"item_code": "_Test Item Home Desktop 100",
 			"qty": 3.0,
 			"transfer_qty": 3.0,
 			"s_warehouse": "_Test Warehouse 1 - _TC",