From doc 965/2012:
ORO.FC.200 Composition of flight crew
(d) Specific requirements for helicopter operations.
(1) For all operations of helicopters with an MOPSC of more than 19 and for operations under IFR of helicopters with an MOPSC of more than 9:
(i) the minimum flight crew shall be two pilots; and
(ii) the commander shall be the holder of an airline transport pilot licence (helicopter) (ATPL(H)) with an instrument rating issued in accordance with Annex I (Part-FCL) to Regulation (EU) No 1178/2011.
(2) Operations not covered by (d)(1) may be operated by a single pilot under IFR or at night provided that the requirements of ORO.FC.202 are complied with.
The closest I could find!
Phil