### **Environment**:

Your OpenProject Version: 12.0.1

### **Steps to reproduce:**

1. Create a work package custom field, tick 'Used as a filter' Begin of the insertion

End of the insertion Begin of the deletion
End of the deletion 2. Create a work package query using this custom field as a filter Begin of the insertion

End of the insertion Begin of the deletion
End of the deletion 3. Edit the custom field and uncheck 'Used as a filter' Begin of the insertion

End of the insertion Begin of the deletion
End of the deletion 4. Open the work package query and try to export as, say, XLS Begin of the insertion


End of the insertion Begin of the deletion

End of the deletion ### **Actual Behavior**

A red error message with Begin of the insertion"Bad request."End of the insertion Begin of the deletion "HTTP failure response ..."End of the deletion

### **Expected Behavior**

The export should Begin of the deletion either

A) Work but not consider the filter
B) Not work butEnd of the deletion let the user know this is due to the disabled custom Begin of the insertionfieldEnd of the insertion Begin of the deletion field, also the filter should be removed from the queryEnd of the deletion

**Discussion**

The filter is not actually shown or used in the UI as expected.
But it's still in the query which then breaks when a work package export is attempted.

Unchecking 'Used as a filter' for a custom field should warn a user if there are queries using it as such. Begin of the insertionOr,  the filter should be removed from queriesEnd of the insertion

The "bad request" response of the request is "cf N doesn't exist".