Nedd help fro production order confirmation

Hi ,

I am using the BAPI 'BAPI_PRODORDCONF_CREATE_HDR' for production order confirmation along with goods movement . The requirement is to add additional field ' Documentary batch - batch number ' field name 'DOCUBATCH_CHARG' . The standard BAPI does not take care of this field . Is there any way on how to extend the BAPI to add the field 'DOCUBATCH_CHARG' or the logic that is needed to insert the field . Please suggest .

Sanjeev