Number range object &1: Error reading interval &2

What causes this issue?

The system was unable to determine the next number of interval &V2& for
the number range object &V1&

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

System Response

How to fix this error?

In Customizing, check whether this interval exists and if so whether it
still contains free numbers.

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.