add payment

lib/pages/invoice/editor/invoice_editor.dart

@@ -437,6 +437,7 @@ class _InvoiceEditorState extends State<InvoiceEditor> {
       invoice.fcsShipmentID = widget.fcsShipment.id;
       invoice.invoiceDate = _invoice.invoiceDate;
       invoice.paymentMethod = _invoice.paymentMethod;
+      invoice.customDuties = _invoice.customDuties;
 
       await invoiceModel.createInvoice(invoice);
       Navigator.pop(context, true);