Dynamic backlog set &1 (activity &2): Number range missing

What causes this issue?

Dynamic backlog sets need a number range so that the extract generation
runs can be displayed.

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?

Procedure for System Administrators

Create a number range for the object ISU_DGEN using transaction SNRO.
Use different number ranges for different dynamic backlog sets. Normally
, one dynamic backlog set is enough.

Error message extract from SAP system. Copyright SAP SE.