I have found some error in FM recently, i have Release Budget 100, After that i Reserve the commitment through Fund Reservation with the value of 20 and the commitment created, so the available amount is 80. I try to return the release budget with the value of 100 via FMBB. Strangely, the system doesnt generate error, i still can save the document, and no error message at all. Somehow, the Release amount not decreased because of Consumption (Commitment) of budget so the process of Return Budget still can be processed. Did anyone has any idea why the system behave strangely like this? Please kindly help me on this topic.