no items or handling units to be placed in storage could be determined

Hello everybody,

I am trying to do an exercise (Handling Unit Management in Shipping) from my SAP Education book (IDES model company), which tells me to create an inbound delivery (VL31N), use a vendor to find a purchase order for a certains material and pack it.

As I couldn't find any purchase order I create one and, afterwards, the inbound delivery/shipping notification.

As I couldn't pack the item in the shipping notification I was suggested to take off the flag on the "Set Unique Number Assigniment fot HU Identification", according to OSS SAP Note 536069.

After that I could pack the item in the Shipping Notification but now I cannot create the transfer order.

The following message arises:

"no items or handling units to be placed in storage could be determined"

Please, can anybody help me?