IDOC to SOAP Acknowledgments

Hallo experts,

as stated above, i have got a scenario where an idoc is mapped into a webservice call, and i am wondering how this should work with acknowledgments.

In IDX_NOALE acknoledgements are required, but fail due to following failure:

Unable to convert the sender service Procomac to an ALE logical system

Could anybody guide me how to solve this problem? I have no special channel configured for the acknoledgement yet!

Is is correct, that only IDOC, RFC, WS and BC-Adapter can receive and handle acknowlegments? Are all other receiver channel able to give acknowlegments back if they are requested by those?

See: http://help.sap.com/saphelp_nwpi711/helpdata/en/49/821e85e2524c4986ee60a8fbe80c7b/frameset.htm

SAP Help does seem to point it out well, because a lot a people asked about acknowlegments already, but it seems that the solving blog post, isn't available anymore, because of this i am asking again!

See: http://scn.sap.com/thread/1342433

Thanks in advance.

Kind regards,

Markus