ACME resources relations

[andriymahats]

At the resource diagram in 6.1 Resources section,
there is an authz resource related to order by “up” relation.

My question is for following case:

The client orders a certificate and
at the time of ordering it satisfied some authorizations (let’s say 2 of 3)
in previous transactions (possibly using pre-authorization: new-authz).

When client queries such previously satisfied authorization,
what order resource shall be pointed using “up” relation,
since that authorization can be used on many orders?

[bifurcation]

This has been addressed by removing the "up" link relation on authz resources (in #298).