Diagnosis
You have attempted to move an object into another position. However thedesired target position is not allowed.
It is only possible to move objects within the list of objects, whichare assigned to the same object. This means, you can change the orderof objects within a list, but you cannot 'remove' objects from a listand insert them into another list. You cannot move any objects into alist, which contains different kinds of objects (for example moving aplanning package into a list of planning areas).

System_response
The original position of the object is not changed.

Procedure
Only move an object within the list which it is already in. The objectis arranged in the list behind the object, on which you positioned theobject to be moved.
Example: The planning levels E1, E2 und E3 (in that order) are in aplanning area. You want to change the levels into the order {E2, E3,E1}. Select E1 and move the level, by pressing the left mouse button,to E3; let go of the mouse button. The system assigns E1 behind E3,resulting in the desired order {E2, E3, E1}.