[PAULUS libro tertio decimo ad edictum. ] §4.8.34.prSi duo rei sunt aut credendi aut debendi et unus compromiserit isque uetitus sit petere aut ne ab eo petatur: uidendum est, an si alius petat uel ab alio petatur, poena committatur: idem in duobus argentariis quorum nomina simul eunt.
[PAULUS in his thirteenth book on the Edict.] If there are two joint parties, either of a credit or of a debt, and one of them has entered into an arbitration agreement, and he is forbidden to sue or is forbidden that he be sued: it must be considered whether, if the other party sues or is sued, the penalty is incurred. The same applies in the case of two bankers whose accounts run together.
et fortasse poterimus ita fideiussoribus coniungere, si socii sunt: alias nec a te petitur, nec ego peto, nec meo nomine petitur, licet a te petatur.
And perhaps we will be able to connect sureties in this way, if they are partners; otherwise, neither is it sued from you, nor do I sue, nor is it sued in my name, although it is sued from you.
§4.8.34.1Semel commissa poena solui compromissum rectius puto dici nec amplius posse committi, nisi id actum sit ut in singulas causas totiens committatur.
I think it is more correctly said that, once the penalty has been incurred, the arbitration agreement is dissolved and cannot be incurred further, unless it has been agreed that it should be incurred as many times for each individual cause.