Control over Suppliment of budget to child wbs

Hello ,

My scenario is that I have a budget allocated to the Parent WBS " HEADER" say for eg budget allocated to parent wbs is 100 under which I have two child wbs with budget allocated 50 respective to each child wbs, as of now the wbs is exhaused till here everything is okie, but when the end user suppliments the budget to the child wbs using tcode cj36 it accepts the value and the bedget at header also changes from original budget 100 to the budget suplimented.

As of now budget of child level wbs does not exceed the parent wbs it gives an error message , but then when u suppliment the budget to child wbs it accepts .

My Requiremnt is that budget of child level wbs should not exceed the budget of parent wbs when additional budget is supplimented at child level

Regards

Sunaina