Request receipt and loading-area availability need separate meanings. This UR5e sleeve plan still puts both under ready. Which shared sequence will expose the disagreement before each supplier writes its own version?
Walk through a request arriving while the machine is occupied. Ask the machine supplier what it acknowledges then, and the integrator what it must still wait for. Put receipt, availability, withdrawal and restart behaviour in one owned interface document; labels follow those meanings, not the other way round.
Both teams now agree receipt while occupied does not permit loading. Separate entries are signed in the shared document. Withdrawal and interrupted-transfer behaviour still need their joint design answer before implementation.