IDOC with ABAP - PI Port , RFC Function module

Hi ,

I am creating outbound Idoc in one system, In the same system I am using a ABAP - PI port and assigned a RFC function module.

So when ever the outbound IDOC is created it will go to the port and triggers the RFC function module.

now my question is how to get the outbound IDOC number in the RFC function module.

I thought of reading the table EDIDC with message type, but all previous IDOC's aslo coming .

Regards

Bhaskar