CO-doc. number assignment not possible for bus.trans. &2 in CO area &1

What causes this issue?

In controlling area &v1&, business transaction &v2& has not been
assigned to a number range.

System Response

CO document numbers cannot be issued.

How to fix this error?

Maintain the number range for CO documents in controlling area &v1&.
Then in the implementation guide (IMG), choose <LS>Controlling ->
General Controlling -> Organization -> Maintain Number Ranges for CO
Documents</>.
Assign business transaction &v2& to a number range group. If required,
create a new number range group.

Error message extract from SAP system. Copyright SAP SE.