Item managed by Serials number - on release only VS SDK

Hi,

As mentioned in the subject, I have an item managed by serial number, on release only.

So, when I do a good receip PO on the purchase order, I do not need to fill the serials number and everything works fine.

When I need to do a delivery, for the same product, now I need to specify serials number BUT the serials number specidifed must be already existing in SAP.

So the question is : how do I create (just before the delivery) serial number for a product manage "on release only" with the SDK ?

Is there an object for this ? Because the serial number object do not have the itemcode property so it raises errors.

Thanks for your help.

Jo