Hi
Here is a quote from Part FCL(easy acces pg 840):
Multi-pilot aeroplanes Applicants for the issue of the first type rating course for a multi-pilot aeroplane shall be student pilots currently undergoing training on an MPL training course or comply with the following requirements: (1) have at least 70 hours of flight experience as PIC in aeroplanes; (2) hold or have held a multi-engine IR(A);...
So, based on this you dont even need to have it valid (however, the company can be more conservative on the matter)
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