Modify Trigger

I have converted Access database to sql express. Access Database had AutoNumber FIelds for which trigger was generated by Upsizing wizard.

Now when I import data from client the autonumber field value changes because trigger is fired which distroys all links

I want to modify trigger so that it generates new number only when it is not supplied in a insert command.

Please help. Code is given below. Also suggest how to save because when I use save, it asks for a new .sql file name and a new file is generated instead of modifying the same trigger



set ANSI_NULLS ON
set QUOTED_IDENTIFIER ON
GO
ALTER TRIGGER [dbo].[T_AcControlLimit_ITrig] ON [dbo].[AcControlLimit] FOR INSERT AS
SET NOCOUNT ON
DECLARE @randc int, @newc int /* FOR AUTONUMBER-EMULATION CODE */
/* * RANDOM AUTONUMBER EMULATION CODE FOR FIELD 'IntAcControlCode' */
SELECT @randc = (SELECT convert(int, rand() * power(2, 30)))
SELECT @newc = (SELECT IntAcControlCode FROM inserted)
UPDATE AcControlLimit SET IntAcControlCode = @randc WHERE IntAcControlCode = @newc