Cumulated changes to the allocations to specific actions not exceeding 15 % of the maximum contribution set in Article 1 of this Decision shall not be considered to be substantial within the meaning of Article 94(4) of Delegated Regulation (EU) No 1268/2012, where those changes do not significantly affect the nature of the actions and objective of the programme. The increase of the maximum contribution set in Article 1 of this Decision shall not exceed 15 %.The authorising officer responsible may adopt the changes referred to in the first paragraph in accordance with the principles of sound financial management and proportionality.