BPC 10 Writeback BADI to calculate delta: IF_CALC_DELTA

Dear experts,

In BPC 10, we need to make calculation in Writeback BADI (UJR_WRITE_BACK) only for the delta amount of planned figure.

For example: Planner entered and saved 100 for the first planning and changed it to 150, in our case I have to get only the delta amount 50 for writeback badi.

We have seen IF_CALC_DELTA as a parameter but do you know how to change this parameter, is there a way to achieve this?

Thanks in advance,

Ergin Ozturk