(1) In the proceedings to contest the paternity, it is presumed that the child is the descendant of the man whose paternity exists under section 1592 nos. 1 and 2 and section 1593.
(2) The presumption under subsection (1) does not apply if the man who has acknowledged paternity contests the paternity and his acknowledgement suffers from a defect in the intention under section 119 (1) and section 123; in this case, section 1600d subsections (2) and (3) are to be applied accordingly.