fix: not able to save BOM Creator (#42540)

erpnext/manufacturing/doctype/bom_creator/bom_creator.py

@@ -365,6 +365,12 @@ def get_children(doctype=None, parent=None, **kwargs):
 	return frappe.get_all("BOM Creator Item", fields=fields, filters=query_filters, order_by="idx")
 
 
+def get_parent_row_no(doc, name):
+	for row in doc.items:
+		if row.name == name:
+			return row.idx
+
+
 @frappe.whitelist()
 def add_item(**kwargs):
 	if isinstance(kwargs, str):
@@ -375,6 +381,11 @@ def add_item(**kwargs):
 
 	doc = frappe.get_doc("BOM Creator", kwargs.parent)
 	item_info = get_item_details(kwargs.item_code)
+
+	parent_row_no = ""
+	if kwargs.fg_reference_id and doc.name != kwargs.fg_reference_id:
+		parent_row_no = get_parent_row_no(doc, kwargs.fg_reference_id)
+
 	kwargs.update(
 		{
 			"uom": item_info.stock_uom,
@@ -383,6 +394,9 @@ def add_item(**kwargs):
 		}
 	)
 
+	if parent_row_no:
+		kwargs.update({"parent_row_no": parent_row_no})
+
 	doc.append("items", kwargs)
 	doc.save()