Diagnosis
You attempted to delete a functional group from the functional area,but one of the fields in this functional group is used in queries.

Procedure
Before deleting a functional group from a functional area, you mustensure that none of the fields in the functional group is used in aquery. Select Environment -> Directories -> All queries todisplay a list of queries which use the field specified in the errormessage. Either modify the queries so that the field is no longer usedor delete the queries altogether. Then, you can delete the functionalgroup from the functional area.