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   3210   Unknown alias name used with field name in index FOR 
              expression

   Problem:   Error occurred in the Advantage Expression Engine parser.
   A field name within the FOR expression was aliased by an unknown alias
   name.

   Solution:  Advantage only supports table aliases for the current
   work area.  If an alias to another work area is referenced, this error
   will result.  Verify the alias name is spelled properly.