535. From 1 July 1986, the only collective agreement applicable to employees of the group is that which was in force on 30 June 1986 and to which the association certified under this subdivision was a party.
The other collective agreements applicable on 30 June 1986 to employees of the group are void for those employees from that date.
Notwithstanding the second paragraph, the employee retains(1) his right to the reimbursement of the convertible days of sick leave to his credit if he is entitled thereto under the collective agreement applicable to him on 30 June 1986, according to the value, terms and conditions established under the collective agreement;
(2) the number of non-convertible days of sick leave accumulated to 30 June 1986, if he is entitled thereto under the collective agreement applicable to him on that date;
(3) his right to a dwelling if he is entitled thereto on 30 June 1986.
The parties referred to in section 512 may negotiate and agree on stipulations allowing the collective agreement applicable from 1 July 1986 to be determined otherwise than in the manner provided in this section, as well as the maintenance of the rights contained in a collective agreement becoming void.