In R 21/11 the Enlarged Board stated that the only condition for the fee for a petition for review to be reimbursed under R. 110 EPC is that the proceedings before the board of appeal are re-opened (a reimbursement request is not required).
Source: http://www.epo.org/law-practice/legal-texts/html/caselaw/2019/e/clr_v_b_3_13_3.htm
Date retrieved: 17 May 2021