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 4103                Indexing on a non-field variable
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 Description
   This warning occurs when an index expression is based on a variable which
   is declared otherwise than a database field. The index generated this
   way is not likely to be useful for seeking the database.

 Solution
   Use at least one database field in the index expression as the basis for
   indexing. The index expression may also contain non-field variables when
   necessary, in addition to the fields.