chore: Add supplier query back

erpnext/stock/doctype/material_request/material_request.js

@@ -365,6 +365,12 @@ frappe.ui.form.on("Material Request", {
 				description: __(
 					"Select a Supplier from the Default Suppliers of the items below. On selection, a Purchase Order will be made against items belonging to the selected Supplier only."
 				),
+				get_query: () => {
+					return {
+						query: "erpnext.stock.doctype.material_request.material_request.get_default_supplier_query",
+						filters: { doc: frm.doc.name },
+					};
+				},
 			},
 			(values) => {
 				frappe.model.open_mapped_doc({