Diagnosis
You want to assign a revision level to a change made to material &V1&with reference to change number V2&.
The change with reference to change number &V2& has already beenassigned a revision level.

Procedure
Please check whether the change with reference to change number &V2&includes the change you require.
If you want to make another change which is to be assigned a revisionlevel, you need to assign the revision level with reference to anotherchange number.