help with multi-valued integer paramater using a stored procedure

I cannot get this to work. I am using ssrs 2008.   I am using the udf list_to_tbl ValentinoV created in is blog and my stored proc is the following.  I created the dataset in ssrs and I can get it to retrive on value (225), but not mulitple values (225,226,229).  My values are like this 225,226,229.

ALTER procedure [dbo].[stp_load_test](@fin_nbr int)
as
begin

declare @local_fin_nbr int
set @local_fin_nbr = @fin_nbr

select distinct customer_nbr_txt, Financial_Company_Nbr from DimCustomer
where Financial_Company_Nbr IN(select * from list_to_tbl(@local_fin_nbr))
end
GO

udf

ALTER FUNCTION [dbo].[list_to_tbl] (@list nvarchar(MAX))
   RETURNS @tbl TABLE (number int NOT NULL) AS
BEGIN
   DECLARE @pos        int,
           @nextpos    int,
           @valuelen   int

   SELECT @pos = 0, @nextpos = 1

   WHILE @nextpos > 0
   BEGIN
      SELECT @nextpos = charindex(',', @list, @pos + 1)
      SELECT @valuelen = CASE WHEN @nextpos > 0
                              THEN @nextpos
                              ELSE len(@list) + 1
                         END - @pos - 1
      INSERT @tbl (number)
         VALUES (convert(int, substring(@list, @pos + 1, @valuelen)))
      SELECT @pos = @nextpos
   END
  RETURN
END
GO