>INDEX ON od_tipo_documento + STR(CTOD("31/12/2100") - dt_documento, 5) TAG TIPO
>
>And everything is working fine (????).
>
>Regards,

Are you trying to put something in descending order? Why not use DESCENDING... or, if you need just the date in descending order, try this...

INDEX ON od_tipo_documento + alltrim(str( {^9999-12-31} - dt_documento ))

Bob