A civil union is void if—
(a) either party did not meet the eligibility criteria under section 7 when the declaration for the civil union was made under section 9 ; or
(b) either party did not freely enter into the civil union because—
(i) the party's agreement to enter into the civil union was obtained by duress or fraud; or
(ii) the party was mistaken about the identity of the other party or the nature of the declaration under section 9; or
(iii) the party was mentally incapable of understanding the nature and effect of the civil union.