CO document: Define number range for transaction &

What causes this issue?

There is no number range defined for activity &V1& in controlling area
&V2&.

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?

Define a number range for activity &V1& in controlling area &V2&.

Error message extract from SAP system. Copyright SAP SE.