Workflows - UNDO - this is NOT answered yet.
There is the option on Tasks to "complete" or "un-complete". This needs to be available for Steps as well as Tasks.
The answer given previously was "make it an outcome", which doesn't suit the need, and is extremely labor intensive. We just want to be able to fix a mistake - you clicked it was done, but it isn't - open it back up.
More information is needed internally before a decision can be made. Nothing is needed from Redtail clients at this time.
This suggestion is remaining open and can continue to gather votes and comments!