The person requesting revocation must show, and shall have the burden of proving, that the acknowledgment of paternity was based upon fraud, duress or material mistake of fact unless the action to revoke the acknowledgment of paternity is filed before the earlier of 60 days after completion of the acknowledgment of paternity or the date of a proceeding relating to the child in which the signatory is a party, including, but not limited to, a proceeding to establish a support order.
If a court of this state has assumed jurisdiction over the matter of the child's paternity or the duty of a man to support the child, that court shall have exclusive jurisdiction to determine whether an acknowledgment of paternity may be revoked under this subsection.
If an acknowledgment of paternity has been revoked under this subsection, it shall not give rise to a presumption of paternity pursuant to K.S.A. 23-2208, and amendments thereto. Nothing in this subsection shall prevent a court from admitting a revoked acknowledgment of paternity into evidence for any other purpose.
If there has been an assignment of the child's support rights pursuant to K.S.A. 39-709, and amendments thereto, the secretary for children and families shall be a necessary party to any action under this subsection.
K.S.A. 23-2209