Kit to stock process, triggered from EWM

Hi,

has anyone here ever managed to get a kit-to-stock process running? In general my process is working, I have a VAS order, an outbound delivery order and an inbound delivery. But both deliveries in EWM use the same BP. As this BP is a vendor, of course the outbound delivery order shows an error and does not create the outbound delivery in ERP. All settings I can think of are done, but still no success. Any pointers what I am missing?

Brgds

Juergen