Workstation- additional fields not updating

Workstation- additional fields not updating

We have recently upgraded to the latest version of servicedesk (build 7011). I have tried to add some additional fields in the workstation - additional fields within the admin section. It seems to work but i cannot edit these fileds or delete them once they have been created!? I have deleted the label and description and clicked on save but the field is still there for the workstation. Is there another way to do this? If not is it a problem that can be fixed in latest releases?

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