The type of relationship between the seconded staff member and the sending organisation (i.e. employment contract, fellowship or other) is NOT relevant as long as:
− it complies with national law
− it complies with internal practices and
− during the secondment it confers legal authority on the sending beneficiary (or associated partner) that enables them to ensure compliance with the Grant Agreement obligations.
As regards staff having contracts with different entities within an umbrella organisation - if the umbrella organisation can justify that the fellow / staff member is assimilated to their own staff under national law or internal practices, then that individual can be considered as a staff member of the beneficiary and so be seconded.
If this is not the case, then the entity holding the contract may be added as an Associated partner linked to a beneficiary, provided the relevant conditions are fulfilled (legal or capital link – longstanding research agreement / collaboration going beyond the project duration).