Function &1 is not declared as "View Switch".

What causes this issue?

The &V1& function is not declared as "View Switch" and therefore cannot
be used as the current view for Fiori.

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

System Response

How to fix this error?

Choose a function that is active and is declared as "View Switch".

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.