Unit of measure &1 is not defined in the system

What causes this issue?

The provided unit &V2& has been converted to the SAP internal unit &V1&,
but this unit is not specified in the system.

System Response

INCLUDE EHPRC_FMD_NA_STOPPROCESS OBJECT DOKU ID TX

How to fix this error?

Contact your system administrator.

Procedure for System Administrators

For more information about converting units in the import, see the
description of the implemented <AB>Convert_Unit</> method in the
<LS>BAdI: Matching for Import </>(<EX>EHPRC_IMPORT_MATCH</>) Customizing
activity under <LS>Product Safety and Stewardship -> Product Compliance
for Discrete Industries -> General Configuration -> Data Exchange ->
Business Add-Ins (BAdIs).</>
Verify the Customizing of the units.

Error message extract from SAP system. Copyright SAP SE.