fix: expense account should be fetched from related asset category

erpnext/controllers/accounts_controller.py

@@ -778,6 +778,9 @@ class AccountsController(TransactionBase):
 								# reset pricing rule fields if pricing_rule_removed
 								item.set(fieldname, value)
 
+							elif fieldname == "expense_account" and not item.get("expense_account"):
+								item.expense_account = value
+
 					if self.doctype in ["Purchase Invoice", "Sales Invoice"] and item.meta.get_field(
 						"is_fixed_asset"
 					):