In T 149/02 the board stated that the two general principles of procedure – prohibition of reformatio in peius and the devolutive effect of the appeal, which conferred on the board the power to consider its subject-matter – were complementary and had to be implemented in such a way that they did not exclude each other.
Source: http://www.epo.org/law-practice/legal-texts/html/caselaw/2019/e/clr_v_a_3_1_2.htm
Date retrieved: 17 May 2021