[ULPIANUS libro uicensimo octauo ad edictum. ] §50.17.43.prNemo ex his, qui negant se debere, prohibetur etiam alia defensione uti, nisi lex impedit.
[ULPIAN, in his twenty-eighth book on the Edict.] No one of those who deny that they owe is prohibited from using also another defense, unless the law prevents it.
§50.17.43.1Quotiens concurrunt plures actiones eiusdem rei nomine, una quis experiri debet.
Whenever several actions concur in respect of the same matter, each person ought to try with only one.