Regulations may provide for disqualifying a relevant parent or a surviving parent for receiving paternity benefit where, during the period for which the benefit is payable, the relevant parent or surviving parent engages in any form of insurable employment, insurable (occupational injuries) employment, insurable self-employment, any employment referred to in paragraph 1, 2, 3 or 6 of Part 2 of Schedule 1 or any self-employment referred to in paragraph 1 or 5 of Part 3 of Schedule 1.