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SQl Recursive problem

Last Modified: 2012-05-12
This is my first attempt at a recursive query and it is not working
I am getting :  Conversion failed when converting the varchar
 value '15286, ' to data type int.  Where is the , coming from?
Here is the code:
       WITH CTE ( CorrBillNO, CopayList, BillNO, length )
          AS ( SELECT CorrBillNO, CAST( '' AS VARCHAR(255) ), CAST( '' AS VARCHAR(255) ), 0
                 FROM TempTbl1
                GROUP BY CorrBillNO
                UNION ALL
               SELECT p.CorrBillNO, CAST( CopayList +
                      CASE WHEN length = 0
                                    THEN ''
                                    ELSE ', '
                                 END + p.BillNO AS VARCHAR(255) ),
                      CAST( p.BillNO AS VARCHAR(255)) , length + 1
                 FROM CTE c
                INNER JOIN TempTbl1  p
                   ON c.CorrBillNO = p.CorrBillNO
                WHERE p.BillNO > c.BillNO )
                  SELECT CorrBillNO, CopayList
                          FROM ( SELECT CorrBillNO, CopayList,
                                                RANK() OVER ( PARTITION BY CorrBillNO ORDER BY length DESC )
                                       FROM CTE ) D ( CorrBillNO, CopayList, rank )
                         WHERE rank = 1

Can you give me an idea of how to break this down to see where
the problem is occurring?  
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