Order cannot be released: settlement rule not maintained

What causes this issue?

Your system has been configured in such a way that you can only
release a <GL:maintenance_order>maintenance order</> if a
<GL:settlement_rule>settlement rule</> has already been maintained for
it.

System Response

INCLUDE 'KEINE-FUNKTION' OBJECT DOKU ID TX LANGUAGE E

How to fix this error?

Maintain the settlement rule and then release the order.

Error message extract from SAP system. Copyright SAP SE.