CMP2 : Work distributed must not exceed total work

Hi Experts,

Can anyone help me on this requirement where in CMP2 (workforce planning), total work distributed for an activity/activity element among personnel resources must not exceed the total work for that particular activity/activity element.

Standard SAP in CMP2 allows you to exceed the total work.

The system must give an error message and must not allow to distribute work more than what has been allocated for that activity/activity element through CJ20N.

Is there any user exit or BAdi to implement this for CMP2?

Thanks in advance

Raashid