Section 72 of the Principal Act is hereby amended by the substitution for subsection (3) (inserted by section 7 of the Social Welfare Act, 1983) of the following subsection:
"(3) Notwithstanding subsection (1), a person engaged in -
(a) short-time employment, or
(b) employment in a period of interruption of employment, in which for the time being, a number of days is systematically worked in a period of 4 consecutive weeks, which is less than the number of days which was normal in the employment concerned prior to the reduction in the number of days of employment:
Provided that the number of days worked is equal to, or exceeds half of the number of days which would have been normally worked in that four week period,
shall not be entitled to pay-related benefit for any day in respect of which he is entitled to unemployment benefit.".