heads of in having not only carri out their political also handle all the commission activities or a substantial part of a delegation's mandate
Heads of delegations, in particular, will have to be able not only to carry out their political role, but also to handle all the Commission activities that are such a substantial part of a delegation's mandate.
Heads of in have be not only carry out their political also handle all the Commission activities are a substantial part of a delegation's mandate.