Error when linking report to stored procedure defined with one input parm

Question

Error when linking report to stored procedure defined with one input parameter
The report will work ok, when the parameter is removed from the stpred procedure
An unhandled win32 exception occurred in crw32.exe[4480]
Stored Proc (sql server 2005)
USE [Allegro]
GO
/****** Object:  StoredProcedure [dbo].[SP_Test]    Script Date: 07/08/2009 10:42:14 ******/
SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
ALTER procedure [dbo].[SP_Test](@valuationmode VARCHAR(55)) as
Begin
select
     valuation,
     valuationtime,
     valuationmode
from valuation
where valuationmode = @valuationmode;
End;

Answer 1

This is an example of a stored procedure that is trying to be linked to a new report as the only datasource.
If I remove the parameter I can create a report, however this will return all of the results of thw query to the report, rather than the desired results. If I add the parameter on the Crystal Report, the stored procedure then has to return all of the results to Crystal and then perform the filtering of records. By using a parameter in the stored procedure, you should be able to do all of the filtering as part of the query on the databse server, making this more efficient.