Multiple idoc submissions on one listener


I’d like to know if there’s a way to specify to SAP how many ‘threads’ a server can use for one program id (listener).

e.g.: I’d like to be able to send 5 idocs in parallel to the same BC listener.

I’ve noticed (SM58) that the messages are ‘queued’ and processed one by one for the same destination even if I specify a certain number of threads in the listener.