Error on Editing in UT Server

Problem:

Editing UT objects via the UT server (e.g. via the UTJSC) does not work.  In the UtilityServer extension, the operation "Edit" is allowed. An appropriate license is available. In the ArcGIS Server Log you can find the following error message.

System.Runtime.InteropServices.COMException (0x8004056E): The object cannot be edited using the current edit session mode.

Solution:

In the UtilityServer extension, the "Use Versioned Editing" property must also be enabled.