How to change calculation of amount within To be collected column in WL

Dear All,

I am on my way to change how system calculates the amount inside To be collected column, because we want to consider Amount Arranged in this column. It is absolutely necessary because most of the time is empty and we cannot register a P2P if so.

I need just a simple hint, just to confirm to me I am in the correct direction if I use standard BAdI UDM_COLL_AMT_C (method CALC_AMOUNT_TO_BE_COLLECTED) to add Amount arranged in column Amount to be collected.

Any other hints are welcome to make this change inside To be collected column.

Thanks in advance.