Project NEgative balance (GI still can be posted even budget 0) - Urgent

Dear SAP guru,

We got a problem with our AVAC (availability check) and Budget Profile (BDG5)for Project system and Investment Management. It happens when we will post GI (reservation). Seems that the AVAC is not blocking the GI , when the available budget is 0.

The scenario is :

Project : NEW-DTCRW101

Our original budget is : RM 16000 (Ringgit Malaysia)

Actual : RM 16000

Try to post GI (RM 1000). It is successfully posted even available budget 0. As a result our available budget is RM -1000. (negative balance)

Best Regards

Nies