Diagnosis
The account assignment is incomplete because some account assignmentconcepts that are necessary for a clear and concise assignment have notbeen entered.

Procedure
The account assignment of a settlement unit requires the entry of thecost element key, the business entity, the recipient key and thereference date.
Account assigments for non-apportionable costs are made on a businessentity or a building (business entity + building) or a property(business entity + property) or on a rental unit (business entity +rental unit).