JAR-OPS 1.1060 Operational flight plan
(a) An operator must ensure that the operational flight plan used and the entries made during flight contain the following items:
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(5) Names of flight crew members;
(6) Duty assignment of flight crew members;
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Note that JAR defines flight crew member as 'a pilot, flight engineer, or flight navigator assigned to duty in an aircraft during flight time'.
At my company we complete a 'voyage report' detailing all of the crew (including the cabin crew) which fulfils this requirement.