Originally Posted by spot
Once you say that- the point automatically goes to the other team. To still take the point after that is cheating.
That's why you say "I thought it was in" it's quite possible that you're partner is right and you're wrong. So, if he still insists he's right maybe he had a better look at the ball. I'm also assuming that no one is trying to cheat, it's just two different looks at a ball. If the call is changed immediately and your partner doesn't agree, you've then accused (at least tacitly) him/her of cheating, not good for you and your partner. If you're partner willingly changes it to an "in" call then all should be fine.