Diagnosis
You have manually processed the assignment for &V2&<(>&<)>V2<(>&<)> inline &V1&<(>&<)>V1<(>&<)> whose validity period clashes with those ofother assignments. The following scenarios are possible here:
The planned assignment completely covers another assignment.
Another assignment completely overlaps the planned assignment.

System Response
The assignment cannot be used.

Procedure
If you want to retain the planned validity period, delete the assignmentthat would be completely overlapped by the one being processed.
In addition, you can also edit the existing assignments, as required.