Web service for custom BAPI

Hi Gurus,

We have created a BAPI as suggested in **************** - Custom BAPI creation - Step-by-step Procedure.

But , while creating web service (BAPI->Alphabetical -> Object-> tools-> create web service -> start wizard) , we are facing the following error.

BAPI zbusobj_dp has not yet been created

Message no. WS_TOOL063

Please suggest with solution

Thanks,

Narendra.