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To the best of my knowledge you could log the time as long as you have a type rating with a MP (multi pilot) ops entry. If it says SP ops, then...
Beware or rather the company neeedss to be aware: for the time being NCC Ops is dutyx time wise still under the old 2.DVO LuftBO regs - duty time sp is strictly limited to 10 hrs from check in to check out. Thus logically, if you fly with 2 pilots and thus can do 14 hrs, the second pilot is a "recognized" pilot and should be able to log the hours. He needs to be rated though.