diff --git a/erpnext/accounts/doctype/sales_invoice/sales_invoice.js b/erpnext/accounts/doctype/sales_invoice/sales_invoice.js
index 2dd3d69..2cb9acf 100644
--- a/erpnext/accounts/doctype/sales_invoice/sales_invoice.js
+++ b/erpnext/accounts/doctype/sales_invoice/sales_invoice.js
@@ -578,6 +578,9 @@
 		frm.add_fetch('payment_term', 'invoice_portion', 'invoice_portion');
 		frm.add_fetch('payment_term', 'description', 'description');
 
+		frm.set_df_property('packed_items', 'cannot_add_rows', true);
+		frm.set_df_property('packed_items', 'cannot_delete_rows', true);
+
 		frm.set_query("account_for_change_amount", function() {
 			return {
 				filters: {
diff --git a/erpnext/selling/doctype/sales_order/sales_order.js b/erpnext/selling/doctype/sales_order/sales_order.js
index b42c615..f692690 100644
--- a/erpnext/selling/doctype/sales_order/sales_order.js
+++ b/erpnext/selling/doctype/sales_order/sales_order.js
@@ -43,6 +43,9 @@
 				}
 			}
 		});
+
+		frm.set_df_property('packed_items', 'cannot_add_rows', true);
+		frm.set_df_property('packed_items', 'cannot_delete_rows', true);
 	},
 	refresh: function(frm) {
 		if(frm.doc.docstatus === 1 && frm.doc.status !== 'Closed'