How to update prices Service Contract in ME33K using FM/BAPI/BADI

Hi Experts,

I have requirements to update prices and add line items in Outline aggrement in ME33K using custom program. I use BAPI_CONTRACT_CHANGE to update the transaction..

The problem is, this BAPI cannot add new line items in Material Contract. This BAPI also cannot update SERVICE contracts.

Your help is very much appreciated.

Thanks,

Irene