It seems that the rules were violated and when this was pointed out, there was a bit of dancing around to include the script anyway.
As someone who is an outsider who can be totally objective about this, what happen looks rather smoky and didn't look quite kosher. It would have been better for the committee to have erred on the side of caution, not including the script. Then they should have clarified just what it is to be a "professional production" so that this doesn't happen again.
One does want to maintain the integrity of the awards and when something like this happens, the value of the award is a bit sullied.