> We have tried using Transport acknowledgemtn (by settings in BPM), and it works, but please tell if application acknowledgemtn can be sent from ABAPA proxy back to XI.
Yes. But you have to define a fault message type and apply this to the interface which is used for ABAP proxy.
In the ABAP proxy, you need to use "raise exception" statement to send a negative application ack message.
A postive application ack is sent automatically, when no exception is raised.
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