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https://estudiotributarioreyes.com/2021/02/16/sunat-2021-%e2%9c%94cronogramas-registros-electronicos-de-compras-y-ventas-ple-r-s-000224-2020-sunat/
SUNAT 2021 ✔Cronogramas Registros electrónicos de Compras y ventas PLE [R.S. 000224-2020/SUNAT]