(a) This act determines the priority of conflicting claims to collateral. However, if the relative priorities of the claims were established before July 1, 2001, former article 9 determines priority.

(b) For purposes of section 400.9-322(a), the priority of a security interest that becomes enforceable under section 400.9-203 of this act dates from July 1, 2001, if the security interest is perfected under this act by the filing of a financing statement before July 1, 2001, which would not have been effective to perfect the security interest under former article 9. This subsection does not apply to conflicting security interests each of which is perfected by the filing of such a financing statement.