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datatype hierarchyid

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Last Modified: 2012-06-27
I have this procedure
CREATE PROCEDURE AddEmployee(@ManagerID hierarchyid, @EmpID int,
@LogID varchar(100), @JobTitle as varchar(200), @JoiningDate datetime)
AS
BEGIN
DECLARE @LastChild hierarchyid
SET TRANSACTION ISOLATION LEVEL SERIALIZABLE
BEGIN TRANSACTION

SELECT @LastChild = Max(OrgNode) From HumanResources.EmployeeDemo
WHERE OrgNode = @ManagerID

INSERT HumanResources.EmployeeDemo (OrgNode, EmployeeID, LoginID, Title, HireDate)
    VALUES(@LastChild, @EmpID,@LogID , @JobTitle, @JoiningDate)
COMMIT
END ;

como puedo usarlo?
I try this
DECLARE @Manager hierarchyid            
DECLARE @FirstChild hierarchyid
DECLARE @employeId hierarchyid
SELECT @Manager = CAST('/2/' AS hierarchyid)          
SELECT @FirstChild = @Manager.GetDescendant(NULL,NULL)              
SELECT @employeId = @Manager.GetDescendant(@FirstChild,NULL)              
print CONVERT(varchar, @employeId)
exec AddEmployee (@employeId,666,'adventure-works\elopez','SW Development', '04/08/73') ;

and i have this error
Incorrect syntax near '@employeId'.
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