I installed ZAM 7.5 and imported many Workstations. These Workstations
where shown under "no department". So i began to change the Department
Field with the edit function. This worked fine, since anything changed.

Now, When i choose a Workstation in the system list and click on the
edit link, the window with User Name, E-Mail, Login-Name, etc. appears.
When i fill out this Form and click on Save, a new web window comes with
the simple text "unable to complete" - no details are shown.

Its no more possible to edit a workstation. What could happen?