Edinburgh head coach Alan Solomons believes Munster fly-half Ian Keatley's match-winning penalty was taken one metre in front of the mark.
The long-range attempt at goal crept over the bar as the Irish province won 16-14 at Murrayfield, but Solomons is not happy with the kick.
"If you look where that scrum is, and where the penalty was taken, there was definitely a metre taken there," the boss told BBC Scotland.
"It looked to me that the ball, had it been taken from the right spot, would have gone under the bar."
Edinburgh did have chances to the win the game, not least with time up on the clock when Sam Hidalgo-Clyne had a drop-goal charged down.
"There's no question about that – we should have won this game," added Solomons.
"I thought key decision-makers at times didn't have the composure. That happens. We made a rod for our own back with silly decisions that were taken.
"It was a superb try and I thought we could get in there at the end, but I think we just had to hold the ball down there and the points would have come.
"I thought we played poorly against Zebre [two weeks ago] and fully deserved to lose. I thought we should have come away with a draw at Connacht [last weekend], and this game is a game we should have won.
"We've got to look at ourselves. It's those little things, those fine margins we spoke about at the end of the game between winning and losing, and we've got to make sure those fine margins fall on our side."