The USE statement specifies Declarative procedures to handle
  input/output errors and database exception conditions.  It can also
  specify procedures to be executed before the program processes a
  specific report group.

  Format 3 -

   USE [GLOBAL] FOR DB-EXCEPTION [ON { {DBM$_exception-condition} ... }].
                                 [   { OTHER                          }]

  Additional Information (explode) :

• DBM$ exception-condition