Where is the relation between sent Idoc and Receiver Determination?

Hello,

In the Configurationtime i have created an IDoc to Soap Scenario (without using party's).

It works.

When I send a IDoc in R3 System to PI the IDoc goes to the right communication channel in the sceanrio.

But which I want to understand is, where is the relation between the sent Idoc to the right scenario ?

In the Receiver Determination i have set the name of the inbound message interface, but where i can find the relation between the sent IDoc an this Receiverdetermination? Where is this specified?

By sending of this IDoc I don't give the name of the inbound message interface, only the portnames and profile names, nothing else.

Thanx in Advance

Best Regards