While working with Tibco iProcess 11.1.0 and Tibco Business Studio 3.2.11 I found that I could not open some work items. The iProcess workspace browser showed the following error message in an alert box:

Error encountered while processing action request:
The iProcess Objects Server returned the following error:
    Invalid Parameter. WString2jobj: FieldType (63) '?' not supported.

There was nothing wrong with the iProcess server: log files were fine and restarting did not improve things. Surprisingly, the work item openened without a problem after deleting field SW_NODENAME from the BusinessStudio form and redeploying.

This leads to the following workaround. I added a field NodeCopy to the BusinessStudio process and a script task in which I copied SW_NODENAME to field NodeCopy. The script task was executed in the process before the manual task. Then I added a new field NodeCopy to the form as well and created the mapping between the field NodeCopy in the process. After deployment the iProcess Object Server error message did not occur any more when opening the work item.