RREO appendix names, account labels, and column suffixes drift across
fiscal years (e.g., RREO-Anexo 04.3 - RGPS for 2019-2022 vs.
RREO-Anexo 04.4 - RGPS for 2023+). The package ships a small reference
table in inst/extdata/rreo_layout.csv that maps (topic, regime, year_range) to the correct appendix and account-matching key.