Rejected due to dependent
I have separated from my ex and we have an agreement that each of us claims one of our children. He filed before me with both kids. He said that he put an exemption for my daughter in order for me to claim her. If she is on the form at all will that cause my return to get rejected? If so, do I need to file form 8332 first or what steps to I or him need to take in order to rectify this situation?