C2046   SEQUENCE nesting error

     Explanation:  You specified a BEGIN SEQUENCE...END control structure
     with a nesting error.  Control structures must be nested properly.
     Furthermore, RECOVER and BREAK cannot be used outside of a BEGIN
     SEQUENCE...END structure.

     Action:  make sure that each BEGIN has a matching END and that any
     other control structure used within the SEQUENCE is also closed with a
     matching END.