[W&R] CIC0 : Service frequency tips - check on notes ?

Hi,

in CIC0 i can create a service from a W&R contract. On the Service frequency tips screen i can customize and add some extra field.

The requirement is to implement a check on one of the fields.

I have found badi /WATP/BD_DLGDIFFCULT, but i cannot find any documentation about this badi.

The only method in the badi is GET_BASE_INTERFACE.

Is there any documentation how to use this badi ?

Or maybe another solution will do the job ?

with kind regards,

Hans