Diagnosis
You are trying to copy data from one plan version to another. Inaccordance with the current customizing settings, number assignment isnot for all plan versions. For this reason, objects with a differentmeaning can be overwritten.

Procedure
Set up the number assignment in Customizing asrequired.

Caution
The number assignment settings do not refer to the objects created upto now. You must be particularly careful when maintaining the objectscreated up to now.