problems with schedule changes comes not from gotogate but SAS itself. While in such cases airfrance klm and lufthansa group allows, you to change trough their customer service or on self-service mode via the app, SAS has this stupid rule where their customer support will not make changes to the ticket but will accept to write a note on the PNR with the routing yiou have chosen. Even worst with their self rebooking system on the app. At fist it let's you chose the alternative routing but you will not be able to get till the end of the reeboking process.