6. Section 4A of the Principal Act is amended—
(a) by omitting from paragraph (1) (a) “child” and substituting “prescribed witness”;
(b) by omitting from subsection (1) “child” (last occurring) and substituting “witness”;
(c) by omitting from paragraph (2) (a) “child” and substituting “prescribed witness”; and
(d) by omitting from subsection (4) “child” and substituting “prescribed witness”.