Contract Creation Using BAPI for Data Migration

Hi,

I am doing Migration of Contracts from 4.6C to ECC 6.0. I have fetched contract data from 4.6C via bapi BAPISDORDER_GETDETAILEDLIST and creating contract via bapi BAPI_CONTRACT_CREATEFROMDATA in ECC 6.0. 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 this be done.

2. Also in this BAPI there is no provision or any table for populating the billing plan. So how can I do this is

there any other bapi for this?