I think it is customary with liaisons that each liaison
is treated as a member in the other organization, and thus one
membership is waived for that person. The liaison then
can get information to the organisations documents,
and attend meetings, and then forward documents after getting
permission to do so to the other organisation.
I believe such an arrangement is necessary for a liaison to
function, and recommend that we do not pursue this if
the liaison does not get access to documents and meetings
in the other organisation.
Or if this is not possible, then do not call them liaison.