SAP Message AO477 - Target version selected is marked for "exclusive use"

Diagnosis
You want to copy plan data to plan version &V1&.

System Response
The indicator for exclusive use is set in plan version &V1&. Since thisversion is only allowed to be used for special purposes, copying theplan values is not possible.

Procedure
Check the Customizing settings of COversions. Remember that any changes to these settings do not takeeffect until you call this transaction again.