How to track details data & XML between ECC and Ariba when PR submit in Ariba

Dear Gurus,

Currently, CIG is used to integrate ECC & Ariba.

The PR will be generated in ECC thru Function module ARBCIG_PURREQ after PR submit in Ariba.

I want to know how to track the info of data & xml exchange between ECC and Ariba when submit a PR in Ariba.

And I've tried T-Code SXI_MONITOR, but can't find any xml related.

As no authority of SRT_UTIL, I cannot try whether it's correct one to tract xml data or not.

Which T-Code can check the xml data in ECC?

Thanks.

Steve