Unit of measure &1 is not defined for declaration of article &2 "&3"

What causes this issue?

The material &V2& <ZK>&V3&</> is not created as an article in the sales
unit &V1& in the company code/country &V4& in REA.

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?

Create the material as an <DS:TRAN.J7L1>article</> in REA.

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.