Since Design > Job Design> Sessions, a session can be created with different levels:
-Right click in the option Add: Here you will be able to add Insert Return code child uproc type.
-Once the uproc added in the session, right click in the uproc and try to use the Move option.
- The option Move is greyed out.
However the uprocs of type Normal Child can be moved (upwards, downwards, towards the left ..etc)
By default, this is a normal behaviour.
The following has been added in the documentation:
Session - Tree section.
A branch can be moved only in relation to another branch of the same type at the same level. A grayed-out option means that it is not available: the branch must be removed and recreated.