Central control function
The usage type has a central control function when the rental unit and the rental agreement are edited.
Usage type and rental unit
The features of a rental unit are determined by means of the Usage type. The usage type is defined in Real Estate Customizing. It controls
By means of an indicator, you can determine for each usage type whether input tax deduction on incoming invoices is to be carried out in cases where the rental units are vacant.
Usage type and rental agreement
Rental agreements are created via rental units. When rental agreements are edited, the usage type of the rental unit controls:
Change usage type
You can change the usage type of the rental unit as long as no active rental agreement exists for a rental unit.
You can only change the usage type of a rental unit with an active rental agreement if the allocation of an internal usage type to the external usage type in Real Estate Customizing is not changed.

If you change the usage type of the rental unit later, it can happen that the screens to be maintained and/or the allowed area types change when you edit the rental unit. The system then deletes the data maintained for the previous usage type in the application menu after issuing a confirmation prompt.
Even if you cancel the change again, the deleted data no longer exists.