Diagnosis
Could not delete the field group as it contains fields that are used inqueries.

System Response
All the field group fields that are not used were deleted. All fieldsthat are used in queries were not deleted. Likewise, the field groupitself was not deleted.

Procedure
Move the fields used to another field group and then delete the firstfield group. Alternatively, you can remove the corresponding fieldsfrom the respective queries and then delete the field group.