ALEAUD in IDOC to File Scenario

Hi,

I have a IDOC to file scenario in which im sending the PAYEXT IDOC from SAP to a bank as the IDOC-XML.

ie the user will create a payment in the SAP system , this shoud trigger an IDOC to XI. XI puts the IDOC-XML sturcture into a FTP folder path from which the bank will pick it up. Now the bank has to send an acknowledgement(asynchronously) that the payment was processed. And this response should be captured and returned to the user.

can we use ALEAUD as the acknowledgement or does using ALEAUD make no sense here?