In a youth game with bases loaded and two outs a ground ball was hit to the pitcher, who made a throw to third base. The throw was low and the third baseman did not field the ball cleanly, so the runner was initially called safe. On appeal he was called out by league rule forbidding head first slides into bases (which he had violated). However, the run remained on the board. Should this have been a force out and the run removed?
I'd say yes. If the illegal slide had been made before the run was scored, then the third out was made at that point and the half-inning was retired, without the run scoring.
The only way it would count is if both the run scored and the hitter had safely reached first base, before the out at third was made, but that sounds rather unlikely. For more on this see this question.