No valid unit of measurement can be determined for ISO code &

What causes this issue?

The document cannot be processed because no unit of measurement can be
determined for ISO code &V1&.

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?

INCLUDE NA_SYSADMIN1 LANGUAGE EN

Procedure for System Administrators

Check the units of measure in Customizing (general settings) and
maintain them if necessary.

Error message extract from SAP system. Copyright SAP SE.