MULTIPLE VALUES PASSING TO STORED PROCEDURE

Hi, 

I have a following stored procedure, I am passing two parameters from the drop down list by using a different dataset. User is selecting multiple values from drop down list in reporting services fromcode a drop down and code b drop down.

I have put the JOIN(Parameters!qual_codea.Value,",") in dataset property for both parameters. But it is only displaying first row in the report. In report I have used simple table and Drag Total, Qualification Code A and Qualification Code B in three columns respectively.

Any Idea why it is not displaying the remaining data for other codes selectedfrom drop down. If i run a query in management studio by using in operation with multiple codes, it display multiple rows which is correct but it is not happening in reporting services.

Any Idea?

ALTER PROCEDURE [dbo].[Multiple_Qualification_Summary]
(
	 @qual_codea nvarchar(10),
	 @qual_codeb nvarchar(10)
)
AS

select DISTINCT 
	 COUNT(b.PRN) as Total
	,A.UKCC_Qualification_Code AS 'Qualification Code A'
	,b.UKCC_Qualification_Code as 'Qualification Code B'
from dbo.Practitioner_Register_Part_Status as a, dbo.Practitioner_Register_Part_Status as b, dbo.Qualification_Register_Part as c
where a.PRN = b.PRN 
  and a.UKCC_Qualification_Code = @qual_codea
  and b.UKCC_Qualification_Code = @qual_codeb
  AND A.IsLatest = 1 AND B.IsLatest = 1
  AND A.UKCC_Qualification_Code = C.UKCC_Qualification_Code
  AND C.QUALIFICATION_ACTIVE_SWITCH = 1
 group by A.UKCC_Qualification_Code 
	,b.UKCC_Qualification_Code 

order by 1

MH