48That being the case, as was recalled in paragraph 44 of the judgment under appeal, where the applicable texts are silent, the principle of legal certainty requires the institution concerned to make that communication within a reasonable time. Failing that, the authorising officer, to whom falls the task of determining, in the debit note, the final date for payment which, pursuant to the very terms of Article 85b of the Implementing Regulation, constitutes the point from which time starts to run, would be able freely to set the date of that starting point without any connection to the point at which the debt in question arose, which, clearly, would run counter to the principle of legal certainty and the objective of Article 73a of the Financial Regulation.
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