Diagnosis
You tried to change the display sequence of the tree structure, so thatan object is moved out of a branch or is moved to an area whichcontains other object types. This is not supported by this function. Itis only possible to change the display sequence of objects of the sametype. Attempting to move the last object of a particular object type ina branch of the tree structure down or the first object up results inthis error message.

System Response
No changes are made to the display sequence.

Procedure
Do not move any objects over boundaries.