Compensation replication from EC to SAP

Hi Friends,

We gone live with EC, Now we are planning to go for compensation. So currently there are no compensation configuration is there in SAP BIB. So please advise me on

1.The precautions i need take with regards to configuration of Additional payments.

2. Importing the meta data for comp, is it going to effect the current setup in SAP?

3. How do I set up the Entity mapping and Value mapping with respect IT0015 and IT0267?

Please help

PK.