BAPI_DELIVERYPROCESSING_EXEC - Mandatory Parameters

Hi guys,

We have to create a delivery from a sales order via bapi or FM. It has to behave as VL01n.

I'm trying to use BAPI_DELIVERYPROCESSING_EXEC, but nothing seems to happen there. In the end of the execution, sy-subrc is equal to 0, but return table is empty, no message at all and the delivery is not created.
Can you give advices on this?

Thanks,

Alm