Maximun no of line in a Outbound delivery while creating via BAPI

Hi Experts,

We area creating a outbound delivery in a Proxy program using the BAPI, if we use more line items means more that 500 , tow Outbound deliveries are created, but only one OBD needs to be created. Is there any limitions for the line items in a OBD, if so how to increase the same.

Thank in Advance