Every p-block with a payment in r-coins by a correct trader p ̸ = ris eventually approved or disapproved by an r-block [provided p and r are friends or have acommon friend in SG(B)]a.
Strange that you need to have a friend-path in order to use r's coins. I'd expect r to accept&approve a message from me, given I hold his coin (which he can see from my message).