La conversion a échoué lors de la conversion de la valeur varchar 'none' en type de données int

Si vos tables sont en fait composées de None et NA, essayez ceci :

ALTER PROCEDURE spvec
AS
SELECT Row_number() OVER (ORDER BY (SELECT 1)) AS 'RNumber'
    ,vf.*
FROM LOGIN ld
    ,vehicle vf
WHERE (ld.fid = cast(vf.fid as varchar(max)))
    AND cast(ld.id as varchar(2)) <> 'NA'
    AND cast(vf.CustID as varchar(4)) <> 'None'
    AND cast(vf.Simo as varchar(4)) <> 'None'
ORDER BY Row_number() OVER (ORDER BY (SELECT 1))