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   3311   Unknown identifier found in index WHILE expression

   Problem:   Error occurred in the Advantage Expression Engine parser.
   An identifier within the WHILE expression is unknown to the parser.

   Solution:  This error is usually caused by the use of memory
   variables within the WHILE expression.  Memory variables are not
   supported by the Advantage Expression Engine as the variables are
   visible only to the client.  This error may also result from a
   misspelled field name or from a field name that does not exist in
   the current work area.