Hi,
As you are having HTTP at the receiver end, you can have System acknowledgments but not application acknowledgments. If you are using IDoc_AAE & Integrated config, you only need to select 'System acknowledgment' & 'System error acknowledgment' in sender IDoc_AAE channel,maintain partner profile for ALEAUD IDoc in ECC & set persistence parameter to true in NWA in path: Configuration-> Infrastructure->Application Resource->Java IDoc Adapter -> Properties.