Combining two Tables with different data type

As per given example, this is how it can be done (I have used a function which would split the strings using cteTally table). But mind you that the function limitation is a string upto 8000 characters. If the string can be greater than that then you can use @Oleg 's solution mentioned in this question

USE [tempdb]
GO

CREATE FUNCTION [dbo].[DelimitedSplit8K]
--===== Define I/O parameters
(@pString VARCHAR(8000), @pDelimiter VARCHAR(1)/*===MADE IT VARCHAR TO AVOID IMPLICIT CONVERSION WHILE COMPARING====*/
)
RETURNS TABLE WITH SCHEMABINDING AS
RETURN
--===== "Inline" CTE Driven "Tally Table" produces values from 0 up to 10,000...
     -- enough to cover VARCHAR(8000)
  WITH E1(N) AS (
                 SELECT 1 UNION ALL SELECT 1 UNION ALL SELECT 1 UNION ALL 
                 SELECT 1 UNION ALL SELECT 1 UNION ALL SELECT 1 UNION ALL 
                 SELECT 1 UNION ALL SELECT 1 UNION ALL SELECT 1 UNION ALL SELECT 1
                ),                          --10E+1 or 10 rows
       E2(N) AS (SELECT 1 FROM E1 a, E1 b), --10E+2 or 100 rows
       E4(N) AS (SELECT 1 FROM E2 a, E2 b), --10E+4 or 10,000 rows max
 cteTally(N) AS (--==== This provides the "base" CTE and limits the number of rows right up front
                     -- for both a performance gain and prevention of accidental "overruns"
                 SELECT TOP (ISNULL(DATALENGTH(@pString),0)) ROW_NUMBER() OVER (ORDER BY (SELECT NULL)) FROM E4
                ),
cteStart(N1) AS (--==== This returns N+1 (starting position of each "element" just once for each delimiter)
                 /*====FIRST ITEM HANDLED AT THE END======*/
                 --SELECT 1 UNION ALL -- does away with 0 base CTE, and the OR condition in one go!
                 /*=======================================*/
                 SELECT N+1
           FROM cteTally  
           WHERE SUBSTRING(@pString ,N,1) COLLATE Latin1_General_BIN = @pDelimiter COLLATE Latin1_General_BIN
                ),
cteLen(N1,L1) AS(--==== Return start and length (for use in substring)
                 SELECT N1,
                        ISNULL(NULLIF(CHARINDEX(@pDelimiter COLLATE Latin1_General_BIN,@pString COLLATE Latin1_General_BIN,N1),0) - N1,8000)
                   FROM cteStart 
                )
--===== Do the actual split. The ISNULL/NULLIF combo handles the length for the final element when no delimiter is found.
/*====FIRST ITEM HANDLING===============*/
SELECT ItemNumber = 0, Item = SUBSTRING(@pString , 1, ISNULL(NULLIF(CHARINDEX(@pDelimiter COLLATE Latin1_General_BIN,@pString COLLATE Latin1_General_BIN),0)-1, 8000)) 
UNION ALL  
SELECT ItemNumber = ROW_NUMBER() OVER(ORDER BY N1),
        Item      = SUBSTRING(@pString , N1, L1)
   FROM cteLen
;
GO

DECLARE @partlist VARCHAR(500)
DECLARE @partqtylist VARCHAR(200)
DECLARE @partqty AS VARCHAR(200)

SET @partlist = 'RPB70-1716,RPB70-001,RPB70-1621'
SET @partqtylist = '100,150,160'


BEGIN
    SET NOCOUNT ON

    SELECT  PartList.Item Part,  PartQtyList.Item PartQty
    FROM    [dbo].[DelimitedSplit8K](@partlist, ',') PartList
            LEFT JOIN [dbo].[DelimitedSplit8K](@partqtylist, ',') PartQtyList
            ON [PartList].[ItemNumber] = [PartQtyList].[ItemNumber]


END

Hi Can some one tell me the reason fr the following error? I use the above code and linked it to a stored procedure to use it in a crystal report. I get an error saying

Query Engine Error: 'ADO Error Code: 0x Source: Microsoft OLE DB Provider for SQL Server Description: Error Converting data type varchar to numeric. SQL State:22018 Native Error: '

Thank You So much for your help.