Hello all,
First ever post. So then, the dreaded problem trying to accept an option as primary and getting the above message.
This has happened me on a number of occasions when I've noticed an error in the existing phase and tried to correct in an option.
THE FIX
I have found a crude way of dealing with this which can involve a bit of time, but gets around the problem if you're really stuck.
Go into the damaged option which you'd like to make your primary and copy clip everything in it. You'll need to do this in a 3d view, in wire frame display, to make sure you select everything. You'll also need to select everything level by level/ view by view if you've added any annotations in views which won't shown up in 3d views. Maybe easier to start with the model elements and follow on after with any annotations.
Create a new option from scratch and paste the model in plan view (select align to current view to make sure it pastes to the exact same location as before. You will need to copy and paste each phase (including demolitions) separately from the damaged option to the new option to preserve any phasing in the model.
Obviously this is not a very quick fix if the model is very complex, but once complete you can accept this new option as your primary (or duplicate it you wish to create a further option of that option).
I'd be interested to know if this problem has a simpler fix.