Create Sales order with reference to Scheduling Agreement with BAPI

Dear experts,

I need to create sales order with reference to scheduling agreement using BAPI.

Is there anyone can provide which BAPI and the parameter I need.

By the way, I need to fill 'pick up date' and  'Customer material number'  for the sales order,

but I cannot find them form 'BAPI_SALESORDER_CREATEFROMDAT2', how to create sales

order with with this two fields?

Hope for your help, thanks.