Use Trigger To Generate Primary Key

I have create a recursive triggers in tblIncident. The PKID is the primary key in tblIncident, in this trigger, i'm trying to generate an auto increament primary key from the stored procedure GetMaxId and update to tblINcident, but I face a problem where PKID does not refresh the latest PKID, it always show the default value 0, until I requery the table. How to get the latest PKID?

/* Trigger in tblIncident */
CREATE TRIGGER GetPKID
ON tblIncident FOR
INSERT AS
DECLARE @PKID int
DECLARE @NEWVALUE int
DECLARE PKID_Cursor CURSOR FOR SELECT tblIncident.PKID FROM tblIncident, inserted
where tblIncident.PKID = Inserted.PKID
OPEN PKID_Cursor
BEGIN
FETCH NEXT FROM PKID_Cursor INTO @PKID

WHILE (@@fetch_status = 0)
BEGIN
SET @NEWVALUE = 0
/*Call stored procedure - getmaxid to get the latest PKID */
EXECUTE GetMaxId "IN", @NEWVALUE OUTPUT
Update tblIncident SET PKID = @NEWVALUE WHERE PKID = @PKID

FETCH NEXT FROM PKID_Cursor INTO @PKID
END
END

CLOSE PKID_Cursor
DEALLOCATE PKID_Cursor