Sigma M30 not locking doors ?

after many button pushes on the keypad to add new remotes the alarm no longer sends the locking pulse when arming, however if locked with the key it sends the pulse to un-lock on dis-arm. However the safety lock feature works when I start the car, Have I pushed an in-correct button and accidently turned off the locking on arming feature ? and if so how do I rectify my problem ??
Hope somebody can help!!!
Regards
Bob Chaston