Re-entering the world of Jira I once again encountered mapping and transition issues.
The import lessons were to remember to consider System Level workflows, Project Level workflows and Board level mappings. The three work together in a non-obvious way. Add to that the need to understand active and inactive workflows, workflows vs. workflow schemas and the Jira approach to publishing changes, and you quickly get lost in a series of dead-end error message such as 'can't edit an active workflow' and the inability to be able to move cards to different status on the board (a common result of not getting changes right).
Also one key thing is to make sure to refresh screens and boards wile doing changes. Some changes are updated real time, others require a page refresh. Easy to get caught out thinking a change hasn't worked when it has.
3. When you change workflow you'll frequently need to then readjust a board to deal with the different status and how they should show.