Hierarchy has been adjusted. Start the query again.

What causes this issue?

Each characteristic value has to be included in a hierarchy with a rest
node. Normally, this is ensured with the data load. However, because
data is not explicitly loaded by virtual or remote InfoCubes,
hierarchies cannot be complete.
In this case, a specification is read that was not yet available in the
respective hierarchy. The system automatically included the missing
characteristic value into the hierarchy. By doing so, the query can
work with the complete hierarchy. However, you have to restart the
query.

System Response

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

How to fix this error?

Restart the query.

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.