Non SAP with SAP PI and SAP IDM

Hi friends,

I have to integrate a non SAP application with SAP IDM.

I have seen this thread:

http://scn.sap.com/thread/3394472

But it's not clear for me, once I dont know IDM so much.

Do you know what kind of adapter I can use to create this cenario?

WEB System --> PI 7.3 (with abap) --> SAP IDM

Thank you so much,

Luciana