(i) `retroactive period` as defined in points (ii) to (iv) means the period from the date of entry into force of the retroactive upward revision of wage rates and ending on the date of signature of the collective agreement or arbitration award; 36.05 The rest days of this Agreement shall be valid only in one week during which a part-time pensioner has worked five (5) days or the weekly hours provided for in this Agreement. (b) In the event that the parties have not been able to resolve the remedy within thirty (30) days of the first meeting, all outstanding issues may be resolved and referred to arbitration in accordance with the provisions of the collective agreement. Neither the worker concerned nor the trade union will pursue a complaint in relation to a negotiated or non-negotiated wage, in accordance with Article 18 of the collective agreement. .