The reviewing of non-unity findings and the refund of additional search fees are dealt with in C‑III, 3.3.
In so far as the examining division finds that unity of invention is given, if the applicant has paid the further search fee(s) and requested a full or partial refund thereof, the examining division will order refund of the relevant further search fee(s).
Source: http://www.epo.org/law-practice/legal-texts/html/guidelines/e/f_v_5_3.htm
Date retrieved: 17 May 2021