@ppscrv The accusative case was generalised in most Romance languages before the first texts, which is shown by the modern forms. E.g. 'ratiō' (nominative) ~ 'ratiōnem' (accusative) became It. 'ragione', Sp. 'razón', Po. 'razão', Fr. 'raison' etc. Many factors were at play, but an important one was that the accusative was always regular, and the difference between singular vs. plural was very systematic:
(-um >) -o ~ -os
(-am >) -a ~ -as
(-em >) -e ~ -es
Here's a graphic I made about it:
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