P1S was always accepted by the UK for licence issue subject to certain maxima however; there is no such thing in Part FCL. PICUS is the nearest thing and under EASA only relates to flights as a co-pilot. CAP 804 does allow PICUS to be used for tests in SPA, but I can find no reference to it being creditable towards an EASA Modular CPL. SECTION 4 Part L (E)
EXPERIENCE
12 The applicant for a CPL(A) shall have completed at least 200 hours flight time, including at least:
(a) 100 hours as PIC, of which 20 hours of cross-country fl ight as PIC, which shall include a VFR cross-country fl ight of at least 540 km (300 NM), in the course of which full stop landings at two aerodromes different from the aerodrome of departure shall be made;
It is creditable towards a MPL FCL 325A
Of these 70 hours, 20 shall be of VFR cross-country flight time as PIC, or crosscountry flight time made up of at least 10 hours as PIC and 10 hours as PICUS.
no doubt based on the FCL010 definition
‘Pilot-in-command under supervision’ (PICUS) means a co-pilot performing, under the supervision of the pilot-in-command, the duties and functions of a pilot-in-command.
As all requiremeents for licence issue must have been met before you can take the Skill Test, the ATO should be able to advise you as they have to make the recommendation for test based on the same criteria.