purchase Order Changes are not reflecting in the SRM Portal

Dear Experts.

I am satating below the scenario which is not working. MY Scenario is Plan Driven Procurement

If My PO is SRM Portal & in NEW status. If this PO is confirmed then COnfirmation is coming to R/3 System.

If after that I am changin MY PO in R/3 & sending the IDOC from R/3 . It is going to SRM but Not Reflecting in the SRM Properly. Like Suppose I have changed PO qty from 100 to 110 in R/3 System & sending the changes from R/3 to SRM through IDOC. PO status remains Confimed only on portal & Qty also remain same as 100.

This is the specific change which is not reflecting in the SRM portal.

So Pls suggest Me.

Thanks & Regards

Gautam khatree