>if "NOT" it is the culprit
>

> WHERE Client.NoProvince=@NoProvince AND
>  (Client.Status>=@Status   OR Client.NoStatus<>@NoStatus)  AND
>  (Client.Status>=@Status2  OR Client.NoStatus<>@NoStatus2) AND
>  (Client.Status>=@Status3  OR Client.NoStatus<>@NoStatus3) AND
>  (Client.Status>=@Status4  OR Client.NoStatus<>@NoStatus4) AND
> Client.NoCountry IN (1,2,3,4,5,6,7) AND
> Client.FirstName LIKE @LXList1Clm_No
>

>avoid the parentheses not possible without a fully expansion of the AND operator

Thanks, I will try that and let you know.