Issues in creation of Contract through BAPI

Hi,

I'm working on R/3 4.6C.

I have created a program for Contracts creation using bapi BAPI_CONTRACT_CREATEFROMDATA.

And it worked fine contracts are created but i have 2 issues:

1. Configuration Setting that is Characterstics Values are not getting populated through this BAPI.How can I do this.

2. Also in this BAPI there is no provision or any table for populating the billing details like billing plan start date, billing rule etc. of the contract. So how can I do this is ther any other bapi for this?

Regards,

Divya