Uniqueness for number range object is limited to one client

What causes this issue?

The external number from a number range interval is only unique for the
client it is in and therefore not suited for distribution or transport
to other systems. Make sure that all handling units that you post goods
issue for have IDs that are unique worldwide.

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?

If you want to assign a unique number at a later date, you must
maintain the type for SSCC18 number assignment.

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.