Each time (if any) that an eligible person decides under section 17 or 20 to receive the medication on a date later than the date initially chosen and specified in the approved form referred to in section 17(2)(d),—
(a)
the eligible person must complete a new approved form to replace the form initially or most recently completed under section 17(2)(d) (a replacement form); and
(b)
references in sections 19 and 20 to the date chosen or chosen time are references to the date and time chosen in the replacement form.