188C 4.31.5 (Severus Alexander, AD 229) ('etiam si fideicommissum tibi ex eius bonis deberi constat, cui debuisse te minorem quantitatein dicis, aequitas compensationis wurarum excludit computationem, petitio auterri eius, quod amplius tibi deberi probaveris, sola relinquitur'); C 4.31.6 (Severus Alexander, AD 229) ('neque scriptura, qua caucum est accepta quae negas tradita, obligare te contra fidem veritatis potuit et compensationis aequitatem iure postulas. non enim prius exsolvi, quod debere te constiterit, aequum est, quam petitioni mutuae responsum fuerit, eo magis, …'); C 5.21.1 pr (Severus Alexander, AD 229) ('compensationis aequitatem iure postulas. non enim prius exsolvi quod debere te consciterit aequum est, quam petitioni mutuae responsum fuerit, eo magis, …').
189Gai D 16.2.5 ('si quid a fideiussore petetur, aequissimum est eligere fideiussorem, quod ipsi an quod reo debecur, compensare malic: sed et si utrumque velit compensare; audiendus est').
190Pap D 16.2.18 pr ('in rem suam procurator datus post litis contestationem, si vice mutua convematur, aequitate compensationis utetur'); Pap D 26.7.36 ('aequitas, quae merum ius compensationis inducit'); Pap D 34.9.15. ('...sed Falcidiae beneficia non utetur, si tantum in amissis portionibus erit, quod Falcidiam aequitate compensauoms recusaret').
191Generally Paul D 44.4.8 pr = Paul D 50.17.173.3 ('dolo facit, qui petit quod redditurus est'), referred to by Zimmermann, Comparative Foundations, 29 (it should be noted, though, that the expression 'dolo petit', quoted ibid and in fn 53 by Zimmermann, is used neither by Paulus nor by anyone dse in the Digest); also Windscheid, Pandektenrecht, § 349.2 and 349.6 fn 19 and FPF von Kübel, 'Aufrechnung' (1882), in W Schubert (ed), Die Vorlagen der Redaktoren für die erste Kommission zur Ausarbtitung des Entwurfs eines Bürgerlichen Gesetzbuches: Recht der Schuldverhältnisse, vol I (1980) 1073--96, 1084.
192Zimmermann, Comparative Foundations, 29, 35; MaxEuP/Zimmermann, 'Set-Off, 1554.
193Zimmermann, Comparative Foundations, 29; MaxEuP/Zimmermann, 'Set-Off, 1554.
194MaxEuP/Zimmermann, 'Set-Off, 1554.
195Zimmermann, Comparative Foundations, 29; MaxEuP/Zimmermann, 'Set-Off, 1554; similarly Loyd (fn 44) 562.
196Explicitly DCFR Princ. 55 ("The: rules on set-off can be seen as based on the principle of efficiency. There is no reason for X to pay Y and then for Y to pay X, if the cross-payments can simply be set off against each other') (no such principle in DCFRincerim); also PICC 8.1, Comment 1 ('Set-off avoids the need for each party to perform its obligation separately'). Practical considerations arc: also cited, eg, byvon Kiibd (fn 191) 1075; Zimmermann, Obligations, 760; id, Comparativ~ Foundations, 35; MaxEuP/Zimmermann, 'Set-Off' ,1554; Gullifer (fu 52) 284 fn 2; Malinvaud, Fenouillet, and Mekki (fn 56) 694.
197Loyd (fn 44) 562.
198Jeffi v Wood (1723) 2 P Wms 128, 129 (24 ER 668, 669) ('It is true:, stoppage is no payment at law, nor is it, of itself, a payment in equity, but then a very slender agreement for discounting or allowing the one debt out of the other, will make it a payment, because this prevents circuity of action and multiplicity of suits, which is not favoured in law, much less in equity'); Percewall Hutchinson v William Sturges (1741) Willes Common Plea Reports 261, 262 (125 ER 1163, 1163) ("The true reason is that this was only substituted in the room of an action, to prevent circuity or a bill in equity'); also von Kübel (fn 191) 1075, 1084; Loyd (fn 44) 541; Zimmermann, Comparative Foundations, 27, 35 (the reference to Hutchinson v Sturges should be replaced with Jeffs v Wood); Derham, Set-Off, 12 (ditto); MaxEuP/Zimmermann, 'Set-Off', 1554 (ditto); Gullifer (fn 52) 283, 284,289, 305.
199Jeffs v Wood (1723) 2 P Wms 128, 129 (24 ER 668, 669) (reproduced in fn 198); Zimmermann, Comparative Foundations, 27, 35 (the reference to Hutchinson v Sturges should be replaced with]effi v Wood); Derham, Set-Off,12 (ditto); MaxEuP/Zimmermann, 'Set-Off, 1554 (ditto; the: quote is taken from Jeffs v Wood rather than Hutchinson v Sturges).
200Pomp D 16.2.3 ('ideo compensatio necessaria est, quia interest nostra potius non solvere quam solutum repetere').
201Very aptly observed by Loyd (fn 44) 562 ('Two distinct motives [se for set-off rules] may be detected; one based on the idea that an injustice is done: the defendant in refusing him this privilege, the other that unnecessary lawsuits are a nuisance. The predominance of the latter notion leads to enactments favonng affirmative relief for the defendant; the predominance of the: former to purely defensive statutes').
124von Kübel (fn 102) 1084 ('Ueber die Voraussetzungen der Kompensation herrscht im Ganzen wenig Streit').
125Zimmermann, 'UNIDROIT Principles', 21; similarly id, Comparative Foundations, .44; id, 'Ius Commune', 13; MaxEuP/Zjmmermann, 'Set-Off, 1555
126This is most obvious from the respective sections in the principal set-off accounts, such as those of Wood, Set-Off, Gernhuber (fn 23), or Terré, Simler, and Lequette, Obligations.
127DCFROutline lntr 29 ('The Article on the requirements for set-off (III.-6:102) has been redrafted afi:er it was drawn to our attention that there was a difference in substance between the English and French texts in the PECL. and it has been expanded to make it dear that the rights being set off against each other must both be available for that purpose, and not for example frozen on the application of an arresting creditor'), further explained 10 DCFR III.-6:102, Comment A.
128PECL 13:101, Comment B ( 4) ('Set-off is also excluded if the debtor may no longer perform because e principal claim has become subject to an order of attachment'); PICC 8.1, Comment 2 (reproduced in fn 27).
129The rule is more sympathetically discussed by Lnb/e and Lehmann/Looschelders and Makowsky, 'Set-Off', 694 f and by Storme (fn 76) 205-7.