Inbound CREMAS idoc acknowledgement -sap po

Hi experts,

I am working on PO 7.5

below is my scenario

3rd party (File)-->SAP PO-->ECC(Cremas idoc)

i am posting Cremas idoc from PO to ECC and i need to send Acknowledgement when the idoc is processed successfully along with vendor number and some other fields

Please suggest how to proceed on this without BPM

if ALEAUD can be used how configuration should be done

Br,

Guru