Bases de Datos - error Arithmetic overflow error converting expression to data type int.

ALTER procedure [dbo].[web_ReporteQA_Defectos_Mensual](

         @iEstacion int,

         @sAlmacenTarget varchar(5)

 ) as

declare @dFI datetime, @dFF datetime, @iTotal int, @iCurrentDay int

	set @dFI ='2016-10-10'​

   -- set @dFI = GETDATE()

	set @iCurrentDay = DATEPART(DAYOFYEAR, @dFI)

	set @dFI = CAST(DATEADD(DAY, 1 - @iCurrentDay, @dFI) AS DATE)

	set @dFI = DATEADD(hour, 6, @dFI)

	set @dFF = DATEADD(YEAR, 1, @dFI)

​

    select @iTotal = count(distinct CajaId)

    from DecisionesE120

    where DecisionFecha >= @dFI

    and DecisionFecha < @dFF

    and Estacion = @iEstacion

​

    select top 5 n.Descripcion as Defecto, count(1) * 1000000/ @iTotal as PPMs

    from DecisionesE120 d

    left join QADefectosEncontrados q on q.DecisionId = d.DecisionId

    left join QADefectos n on q.DefectoId = n.DefectoId

    where d.DecisionFecha >= @dFI

    and d.DecisionFecha < @dFF

    AND d.Estacion = @iEstacion

    and d.AlmacenId = @sAlmacenTarget

    and q.DefectoId is not null

    group by Descripcion

    order by count(1) desc