find the Inbound IDOC

Hi Experts,

I have a requirement to get the Inbound IDOC for particular PO. I have used the following method:

http://forums.sdn.sap.com/thread.jspa?threadID=1082790

That means using tables:

A) SRRELROLES

B) IDOCREL

This is working for most of the cases except if the inbound IDOC is amended by the sender ( ex:- requested quantity changed ).

1. If inbound IDOC received without any changes, it will be there in SRRELROLES as roletype = 'INBELEG'.

2. If inbound IDOC received with changes it is not there in SRRELROLES.

Could you please help me to resolve this issue?

Thanks,

Chaminda