Would be something like this: - Item Fulfillment UE - beforeSubmit read which lines, read createdfrom Field to have the SO Internal ID - Transform the SO to Invoice - Set the sames lines on the Invoice that you read from the Item Fulfillment.. - Done... I also create another custom body field for Invoices so I know that Invoice from which Item Fulfillment was created... because invoice only show you Sales Order but not fulfillment...