Hi Frédéric,                         
               I am having an issue with the datetime parameter function. Below is my query. I'm using SQL Business Intelligence Studio, SP 2. When I run the query it prompts me for the date parameters, but throws a sql exception after I enter them. I haven't been able to find the log files with the exception, but I suspect it's the date format, because if I remove the parameters, the query runs ok. I thought ERSDE handles the date format conversion? Do you have any ideas? Thanks.

<?xml version="1.0" encoding="utf-8" ?>
 <root>
<list title="xxx" relativeSiteUrl="/xxx" tableName="results" useDisplayName="true">
<fields> </fields>
<query>
<Where>
            <And>
               <Geq>
                    <FieldRef Name = "Start_Date" />
                    <Value Type="DateTime"> @firstDate!</Value>
              </Geq>
               <Leq>
                    <FieldRef Name = "Start_Date" />
                    <Value Type="DateTime"> @lastDate!</Value>
              </Leq>
           </And>
</Where>
</query>
</list> </root>

Hi Frederic, 
               Forgive me, I'm new to Business Intelligence Studio, when I looked at the code, the parameters were indeed cast as a String. I am still working on making the changes, but I'm betting that's the problem. Thanks for the quick reply. Our evaluation of the trial edition of ERSDE is going quite well so far.