Diagnosis
You have not assigned a cost center to the rental unit.
However, the cost center is a required field in Customizing.

System Response
You cannot save the rental unit without assigning a cost center for thevacancy posting.

Procedure
Assign a cost center.
If this is not possible, contact your system administrator.
RESET N1

Procedure for the system administrator
Check and correct the settings for the cost center data for the rentalunit in Customizing as required.
If the setting in the required field is correct, the cost centers mustbe defined in Customizing for Controlling.