SAP Note 18770 - Maintenance order: Status ABRV is not set

Symptom:

Although a settlement rule exists, status ABRV (settlement rule exists) is not set.

Cause and prerequisites

Incorrect status table settings.

Solution
Business transaction KABV ( = Maintain settlement rule ) must set system status I0028 ( = ABRV ).
Note:
You can set the status control via transaction BS32.