français vers anglais Affaires / Finance Assurances Legal memo on self-insurance

"En effet, le processus négocié entre [insurance company] et [insured company] est à notre avis non seulement légal mais également adossé à un schéma d’organisation cohérent."

Please see my previous question if you need further info. on context (very briefly, this is discussing self-insurance programmes).

I'm not entirely sure how to translate 'adossé' here. I keep thinking of 'akin to', but perhaps it has more of a sense of 'piggybacking on', i.e. that it is grafted on to an already accepted scheme.