Мой источник - Дион Кассий, XLIII, 51
But while Caesar was thus engaged, a longing came over all the Romans alike to avenge Crassus and those who had perished with him, and they felt some hope of subjugating the Parthians then, if ever. They unanimously voted the command of the war to Caesar, and made ample provision for it. 2 Among other details, they decided that he should have a generous number of assistants, and also, in order that the city should neither be without officials in his absence nor, again, by attempting to choose some on its own responsibility, fall into strife, that the magistrates should be appointed in advance for three years, this being the length of time they thought necessary for the campaign. Nevertheless, they did not designate them all beforehand. 3 Nominally Caesar chose half of them, having a certain legal right to do this, but in reality he chose the whole number. For the first year, as previously, forty quaestors were elected, and now for the first time two patrician aediles as well as four from the plebs. Of the latter two have their title from Ceres, a custom which, then introduced, has remained to the present day. 4 And praetors were appointed to the number of sixteen; it is not of this, however, that I would write, since there had formerly been just as many, but of the fact that among those chosen was Publius Ventidius. [...]. 6 All were thus appointed in advance who were to hold office the first year after that, but for the second year only the consuls and tribunes; so far were they from appointing anybody for the third year.
Насколько я понимаю, здесь речь идет о том, что на 43 г. были назначены все должностные лица, а на 42 г. - только консулы и трибуны.
А какой источник говорит о пяти годах?