Cancelled Confirmations not posted in backend

Hi All,

We are having issue where cancelled confirmations are not posted from SRM to ECC.

We have Extended Classic scenario, once the confirmation is cancelled, the status will be approved and it will not trigger idoc.Normal confirmations will create IDOC without any issue and it is also posted to backend. Do we have to maintain any config for cancelled confirmation idoc? please advise.

Thanks,

Sunil