2026-10_FICTIONAL-COMPANY/
|-- 00_INDEX_AND_EXCEPTIONS/
|   |-- package-checklist.csv
|   `-- unmatched-items.csv
|-- 01_ISSUED_INVOICES/
|-- 02_RECEIVED_INVOICES/
|   |-- SOURCES/
|   `-- WORKING_COPIES/
|-- 03_RECEIPTS/
|   |-- SOURCES/
|   `-- WORKING_COPIES/
|-- 04_BANK_STATEMENTS/
|   |-- PDF/
|   `-- STRUCTURED_EXPORTS/
|-- 05_SUPPORTING_DOCUMENTS/
`-- 99_EXPORTS_FROM_SYSTEMS/

All names and records in this example are fictional.
Keep original source files separate from compressed, merged, rotated, or renamed working copies.