Simulate Order with NFM (Non ferrous Metal)

I would like to simulate pricing on a sales Order.

I know thoses BAPI which work prefectly well:

BAPI_SALESORDER_SIMULATE

BAPI_SALESORDER_CREATEFROMDAT2

But i do not know how to add NFM data into structures of both Function module. I need it because pricing calculation is using those NFM data.

Thanks a lot for your help.

Franck