Hate to tell you, but whatever company you work for, the "real" corporate ledger is probably in Excel.
Whole lot of ERP consulting later, you find out this sort of "master" data source is VERY common. Maybe its not always Excel, but often there's some weird master data that someone in Finance and maybe someone in Operations has to manually fuck with to make things make sense.
What's cool is when it's something else really wild like Lotus 123 (but the DOS version), SuperCalc, Multiplan, some random shit someone came up with in a dBase-like software written in ALGOL-60 that runs on PDP-15 and is in fact the reason that they still have a fucking PDP-15 and it actually just write the data to a TSV which is thing transferred over a serial port through a pearl and then to their ancient Sony NEWS system and then gets imported into SAP. You try to take the TSV file make it into a CSV and import it into SAP, but then nothing works and eventually 113 million dollars later, you just leave the PDP-15 and Sony NEWS in place but buy 4 spares from Yahoo! Auctions JP. (I wish this last part was actually a joke, but sadly it is not.)