BAPI to update CJR2 Revenue Plan

Hi Experts,

We are planning to create a program to update revenue plan in CJR2.

What should be the best way to do it? Basically the custom program does some calculations and then updates the revenue plan.

Which BAPI should we use here? and what the method to find a BAPI for it ?

Or is BDC better option here?

Or any other suggestions. I am aware of the WBS -excel integrated planning option.

Thanks,

Krishna