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Stored procedure and function returning unexpected results
DECLARE @SeqNo int;
DECLARE @CharNumber varchar(10);
EXEC  dbo.sp_GetNextCounter 'ITEMTYPE', @SeqNo OUTPUT;
EXEC @CharNumber=dbo.rf_f_CIntToChar @SeqNo, 6;
SELECT @CharNumber;

@param0 varchar(12),
@SeqNo INT OUTPUT
AS
BEGIN
IF (@param0 IS NOT NULL)
BEGIN
    set nocount on
    DECLARE @reqseqno INT
    SELECT @reqseqno = CounterValue FROM Counters WHERE CounterName = @param0
    UPDATE Counters SET CounterValue = @reqseqno + 1 WHERE CounterName = @param0
    SELECT @reqseqno AS 'SeqNo'
END
END
GO

(@intVal int, @intLen int)
RETURNS varchar(10)
WITH EXEC AS CALLER
AS
BEGIN
IF @intlen > 20 SET @intlen = 20
IF @intlen < LEN(@intVal) RETURN RIGHT(CONVERT(varchar(10), @intVal), @intlen)
RETURN REPLICATE('0', @intLen - LEN(@intVal)) + CONVERT(varchar(10), @intVal)
END
GO