Unit of Measure: Additional customizing required for ISO code &2

What causes this issue?

The unit of measure source value &V1& is mapped to ISO code &V2&.
The issue is caused by either:
ISO code is not assigned to an internal unit of measure (UoM).
The ISO code is assigned to one or more UoMs but no one is flagged as
primary.
The ISO code is assigned to more than one UoM that are all flagged as
primary.

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?

ISO codes need to be linked to an internal unit of measure. Please check
your UoM configuration and make the necessary changes.
The ISO codes are stored in table T006I.
The UoMs are stored in table T006.
SAP S/4HANA (S4CORE On premise):
Please check the following SAP Note
<DS:URLA.https://launchpad.support.sap.com/#/notes/2341050>2341050</>
and follow the instructions of that SAP Note incase one of the mentioned
ISO codes is missing.
SAP S/4HANA Cloud (SAPSCORE):
Contact the Service Center to implement the SAP Note
<DS:URLA.https://launchpad.support.sap.com/#/notes/2341050>2341050</> in
case one of the mentioned ISO codes is missing

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.