Problem in TO confirmation with HU in delivery

hi,

i have a problem during the confirmation of a TO with HU.

from delivery i create the TO for materials packed in one HU. While i'm confirming this TO the system gives me the message "Enter a storage unit".

If i put the "source storage unit" in the field "dest. storage unit", the following message appears "Dest.handling same as source handling unit only allowed for HU takeover".

In customizing: Logistics-general--->handling unit management-->basics--->WM--->define storage type

i set the HU picking control as 1 "propose source HU as destination HU"

and in ---> define movement types

i set HU picking control as 1 "Propose source HU as destination HU".

What's wrong.

thank you vrey much

Marco Zeno