Diagnosis
Task &V1& is already blocked for preceding group &V2&. This is why it isno longer possible to unblock task &V1& for the organizational unithighlighted by the cursor, which is subordinate to consolidation groupV2 in the hierarchy.

System Response

Procedure
First, unblock task &V1& at the highest preceding group that is abovethe organizational unit highlighted by the cursor.
Once task &V1& is no longer blocked for all preceding groups, you canunblock the task for the organizational unit highlighted by the cursor.