thanks all for the comments.

the use of the stored procedure 4 this solution might seem not so obvious but i do personally prefer sp instead of adhoc launched from data...

Yes, that should be the right way to do.

Thanks gil.milbauer...

CREATE PROCEDURE dbo.sp_NewSequentialId

(@Id AS UNIQUEIDENTIFIER OUTPUT)

AS

BEGIN

SET NOCOUNT ON;

DECLARE @NewSequentialId AS TABLE (Id UNIQUEIDENTIFIER DEFAULT(NEWSEQUENTIALID()))

...

thanks a lot...

"INSERT INTO @NewSequentialId DEFAULT VALUES;"

actually i don't know i can use DEFAULT VALUES :)-