fix: not able to change default BOM in the Subcontracting Order

(cherry picked from commit 11b2994fe8)

erpnext/subcontracting/doctype/subcontracting_order_item/subcontracting_order_item.json

@@ -242,6 +242,7 @@
   {
    "depends_on": "item_code",
    "fetch_from": "item_code.default_bom",
+   "fetch_if_empty": 1,
    "fieldname": "bom",
    "fieldtype": "Link",
    "in_list_view": 1,
@@ -336,7 +337,7 @@
  "index_web_pages_for_search": 1,
  "istable": 1,
  "links": [],
-    "modified": "2022-08-15 14:25:45.177703",
+ "modified": "2023-01-20 23:25:45.363281",
  "modified_by": "Administrator",
  "module": "Subcontracting",
  "name": "Subcontracting Order Item",