Budget get distributed from higher to lower level more than budget available in higher level.

HI all

In superior Fund center and superior commitment. I have budget 100000, but while distributing to lower fund center and lower commitment in FMBB, it is allowing to distribution more than 100000, I want to distribute from higher level to lower level the amount which is less than budget present in superior level.

kindly let me know any solution is available for the same.