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yeah, these accounting table field names have not changed since around 30 years, which is not necessarily a bad thing...

for a human readable view of this you can look e.g. here https://docsfortec.com/sap/S4/tables/ACDOCA

They're a bit of a bilingual mess.

Did they start out with German table names and decide to give new tables English names at some point?

Out of the guts, the only maybe english abbrev is docln = document line (?). Referring to the example, not the link.