Simple conditions are not supported

When adding a decimal field type to a file cabinet I received a "Simple conditions are not supported" error and the field was removed. I have never seen this before.

Any clues appreciated.

Dear Steve Shriver! It looks like the Community cannot answer your question. That's why we have opened a Support Request with the Number SR-147932-M5G7P for you. A Software Support Specialist will contact you directly to follow up. We will update this thread with the solution as soon as we have resolved the Support Request. With best regards, DocuWare Support Team