Diagnosis
The rental unit or an object which is dependent on the rental unit(e.g. a rental agreement for this rental unit) is being processed byanother user at present. If you have just processed the rental unityourself and saved your changes on exiting the function, it is possiblethat the system has not yet finished saving the data changed. You arerecommended to wait a moment and then to call up the function again.

System Response
You can only enter the function again if the user &V4& has finishedprocessing.

Procedure
You can view the rental unit in display mode but you are only able tomake changes again when the rental unit is released by the other user.