When you are reviewing a document set, you may delete individual documents from the set or the complete set. You delete individual documents by highlighting the record and pressing the Delete key. If you press the Record Delete icon, the complete set information will be deleted. However, you need to delete the individual documents from the set before deleting the set itself.
Deleting a document from a document set only removes the document association with the current set. It does not remove the document from the database.