DI Server GetByKey for Invoice not returning Serial Numbers

Hi,

I am running SBO 2005 SP01 PL36 and I have entered an Invoice through the Business One front-end, selecting the relevant serial numbers for my items.

I want to use the DI Server to get the invoice that was added and use the serial number information to automate some other business processes. But when I do a GetByKey for the Invoice it returns ok but the serial numbers are not returned in the response.

When I call GetObjectXmlSchema I am returned the Business Object schema that has a SerialNumbers Element within it.

Is this a bug within the DI Server or is there another way in which I can get the Serial numbers for the Invoice?

Cheers,

Darren