I changed the WM Server and Developer version (4.0.1 to 4.6)
When i open the wm Developer and select my Flow Service (by example. or anyone else), this is in “read-only” mode, i can change my service !!!
In IS 4.6 we have a new stuff which locks the service and make it unavailable to other users it helps us in two persons changing the services in the same time.
You have to right click on the service and click lock now you should be able to make changes on that service. Once you are done with that service dont forget to unlock the service because others may not be able to change anything on the service.