The claimant is the best source of information about their past work.  However, if
                  the claimant is having difficulty providing information a Detail Earnings Query (DEQY),
                  Summary Earnings Query (SEQY), or other query may be accessed to help you resolve
                  any questions.
               
               Use of a query is not required, however, if a query is used, it must be added to the
                  electronic folder (EF).
               
               For additional information on resolving insufficient vocational evidence using a DEQY
                  or a SEQY follow DI 22515.020B.