SFA find in ref McDonalds favour
On the advice of assistant referee Steve Craven, McDonald overturned the decision and re-started play with a drop ball, much to the anger of Celtic boss Neil Lennon, who made an official complaint.
An SFA enquiry deemed McDonald to have made the correct decision but criticised the referee's match report and highlighted concerns over his 'post-match administrative process'.
"He has been give a warning by the referees committee for not articulating the findings at the end of the match and he has accepted that," SFA chief executive Stewart Regan said.
"Referees are measures by performance. The minute Dougie McDonald overturned a penalty decision, that would have had an impact on how he was judged.
"The score he received was a 7.9. Anything beneath an eight is judged not to be a satisfactory score, so he was marked down below standard."
Craven, whose family received personal abuse following his part in the controversy, has since quit the professional game.
Regan admitted that his resignation was due to his disgruntlement at how McDonald and the SFA had handled the fall-out.
He said: "He (Craven) was disappointed in the way Dougie McDonald had articulated the incident and the whole episode had been played out in the media after the match.
"One of the concerns Steven had was his role in this whole matter had not been fully articulated and not made clear to the referee's observer and we looked at that in the investigation.
"Dougie hasn't accepted responsibility for Steven Craven's resignation, his resignation covers other matters and we are looking at those matters in an internal discussion.
"I'm not sure if more referees will resign, the issue is whether referees will want to come into the game in the future if we continue to behave in this manner."