Unit of measurement profile &1 does not exist

What causes this issue?

You specified the unit of measurement profile &v1&. This profile does
not exist.

System Response

The system is unable to convert the units of measurement.

How to fix this error?

If you specified the unit of measurement profile directly, specify an
existing one.
If the unit of measurement profile was taken from your user settings,
change your user settings. The parameter is ESUNITPROF.

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.