diff --git a/erpnext/buying/doctype/purchase_order/purchase_order.js b/erpnext/buying/doctype/purchase_order/purchase_order.js
index 521432d..d6f0f0e 100644
--- a/erpnext/buying/doctype/purchase_order/purchase_order.js
+++ b/erpnext/buying/doctype/purchase_order/purchase_order.js
@@ -28,6 +28,9 @@
 			}
 		});
 
+		frm.set_df_property('packed_items', 'cannot_add_rows', true);
+		frm.set_df_property('packed_items', 'cannot_delete_rows', true);
+
 	},
 
 	company: function(frm) {
diff --git a/erpnext/selling/doctype/quotation/quotation.js b/erpnext/selling/doctype/quotation/quotation.js
index 1223449..0e1a915 100644
--- a/erpnext/selling/doctype/quotation/quotation.js
+++ b/erpnext/selling/doctype/quotation/quotation.js
@@ -18,6 +18,8 @@
 			}
 		});
 
+		frm.set_df_property('packed_items', 'cannot_add_rows', true);
+		frm.set_df_property('packed_items', 'cannot_delete_rows', true);
 	},
 
 	refresh: function(frm) {