Commitment in WMBS element

Dear Gurus,

I need advice for this problem.

the condition :

there is a PR and PO that assign to WBS Element with Single account determination. in my opinion when create PR&Release PR adopted from Service Entry commitment created, after that Create PO&Release PO the commitment from PR move to PO. (Correct me if i'm wrong).

When i check S_ALR_87013558, this report show commitment-Total value from PR + PO commitment

After i drilldown, there show PR-RMBA Commitment and PO-RMBE Commitment,

From above report shown there is something wrong, why PR Commitment still available ? even PO has Create and Release ?

I check for report CJI5 show like this

But in CJ30 show like this

the assigned refer to S_ALR_87013558, its mean there a double Commitment from PR and PO.

Anyone has been meet this problem before ? anyone have suggestion/advice for my problem ?

Thank You,

Iwan Siahaan