fix: manually added weight per unit reset to zero after save (#27330) (#27338)

(cherry picked from commit 7b4a65484a)

Co-authored-by: rohitwaghchaure <rohitw1991@gmail.com>

erpnext/public/js/controllers/transaction.js

@@ -487,6 +487,10 @@ erpnext.TransactionController = erpnext.taxes_and_totals.extend({
 		var me = this;
 		var item = frappe.get_doc(cdt, cdn);
 		var update_stock = 0, show_batch_dialog = 0;
+
+		item.weight_per_unit = 0;
+		item.weight_uom = '';
+
 		if(['Sales Invoice'].includes(this.frm.doc.doctype)) {
 			update_stock = cint(me.frm.doc.update_stock);
 			show_batch_dialog = update_stock;