sqlServer decimal a base múltiple

ALTER  FUNCTION [dbo].[fn_AlgorismToOther]
(
@BaseString VARCHAR(50),
@Value BIGINT,
@StringLength	INT
)
RETURNS varchar(50)
AS  
--select dbo.fn_AlgorismToOther ('0123456789abcdef',52185+1,8) as m

BEGIN 
	DECLARE @m_ReturnString varchar(50),
			@m_Base BIGINT,
			@m_Position INT

	
	SET @m_ReturnString='' 
	----Check the valid data
	IF ISNUMERIC(@Value)=0
	BEGIN
		RETURN @m_ReturnString
	END

	SET	@m_Base=LEN(RTRIM(LTRIM(@BaseString)))
	IF @m_Base=0 OR @m_Base=1
	BEGIN
		RETURN @m_ReturnString
	END
	IF (@m_Base>30 AND @StringLength >12) OR (@m_Base>40 AND @StringLength >10)  ----if it is too big,it will raise the arithmetic overflow error
	BEGIN
		RETURN @m_ReturnString		
	END
	IF 	@Value > POWER(@m_Base,@StringLength)
	BEGIN
		RETURN @m_ReturnString
	END
	


	SET @m_ReturnString = SUBSTRING(@BaseString,@Value % @m_Base +1,1)
	SET @Value = FLOOR(@Value/@m_Base)
	WHILE @Value > 0
	BEGIN
		SET @m_ReturnString = SUBSTRING(@BaseString,@Value % @m_Base +1,1) + @m_ReturnString
		SET @Value = FLOOR(@Value/@m_Base) 
	END	
	
	SET @m_ReturnString=REPLICATE('0',@StringLength-LEN(@m_ReturnString)) + @m_ReturnString  

	RETURN 	@m_ReturnString	
END

transferir

 dbo.Fn_algorismtoother('0123456789ABCDEFGHJKLMNPRSTVWXYZ', @serialno, 3)