Hi Gabriel,
Check if you are using RefCt Indicator then control key will be used to all new routings will be created after the date of this change.
So you can change this key from PM01 to ZPM1 in workcenters, the orders which are created with old key will not be effected with this activity, but if you want this change effect then you need to create new routings with RefCt indicator & ZPM1 key in workcenters then it will be effected in routings and orders as well.
Thanks
Neeraj Dixit