Key figure &1 cannot be used as a navigation attribute

What causes this issue?

You are trying to use a key figure as a navigation attribute. This is
not supported.

System Response

You cannot activate the characteristic unless you make all key figures
display attributes.

How to fix this error?

Switch all key figures which you have enabled as navigation attributes
to display attributes.

Procedure for System Administrators

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

Error message extract from SAP system. Copyright SAP SE.