Do not use the association &1.

What causes this issue?

In the consumption CDS view, a path expression that is closed using an
association is used. Only a one-step-association can be used in the
consumption view.

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?

Remove the path expression that is closed using an association from the
CDS view.

Procedure for System Administrators

Contact the corresponding developer of the CDS view to correct the
error.

Error message extract from SAP system. Copyright SAP SE.