[NERATIUS libro primo responsorum. ] §19.5.6.prInsulam hoc modo, ut aliam insulam reficeres, uendidi.
[NERATIUS in the first book of Responses.] I sold an apartment building on this condition, that you should repair another apartment building.
respondit nullam esse uenditionem, sed ciuili intentione incerti agendum est.
He responded that there is no sale, but one must bring an action with a civil intentio for an uncertain amount.