ISO code for special unit of measure &1 was not found

What causes this issue?

The system could not determine the ISO weight unit for the special unit
of measure &V1&.

System Response

The system issues an error message.

How to fix this error?

Check if you maintained the ISO weight unit prescribed by the
authorities for the special unit of measure &V1& in Customizing (Global
settings - Units of measure).

Error message extract from SAP system. Copyright SAP SE.