apply sorting for make multiple variant attributes (#14073)

diff --git a/erpnext/stock/doctype/item/item.js b/erpnext/stock/doctype/item/item.js
index fbf0ded..4f0bd0d 100644
--- a/erpnext/stock/doctype/item/item.js
+++ b/erpnext/stock/doctype/item/item.js
@@ -472,7 +472,8 @@
 							fields: ["attribute_value"],
 							limit_start: 0,
 							limit_page_length: 500,
-							parent: "Item"
+							parent: "Item",
+							order_by: "idx"
 						}
 					}).then((r) => {
 						if(r.message) {