Stock Transport Delivery cannot be added to a Transport (VT01N)

Hello friends...

I have the following scenario regardig Stock transport orders.

We generate the UN Purchase Order and generate the delivery (type ZDNL) Delivery Utem type ZDUN.

We can do the pack and we can do the post good issue.

But when we tried to add this deliery into a transport (txn VT01N) the system did not found it.

What could we miss in configuration?

If one of you have an idea will be great!

Thanks in advance.