It means that, as the workflow you are currently editing is active and in use by at least one project, then you have to make a copy of said workflow, do the changes you couldn't do when receiving that message, and finally set that modified workflow to substitute its previous version.
I have multiple projects that use variations of the same base workflow. The variations depend on the requirements of the project or issue type. The variations mostly come in the form of new statuses ...
Connect with like-minded Atlassian users at free events near you!Find an event
Connect with like-minded Atlassian users at free events near you!
Unfortunately there are no Community Events near you at the moment.Host an event
You're one step closer to meeting fellow Atlassian users at your local event. Learn more about Community Events