when going to enter a team of horses into a team event, the first box has Horse A & Horse B, the second has the option of "select horse as team leader" or putting it on a team with a horse...
well if you choose Horse A as team leader you can set Horse B as the second horse
but if you choose Horse B as team leader you ONLY have the option to set Horse A as team leader...thus having two 1 horse teams, it will not allow you to set Horse B as leader & then put Horse A on Horse B's team