Purpose
What this converter does
Inspect the original XLSX bytes and review its real worksheet and column mapping, including hidden rows, formulas and identifier precision. Supply independently verified Spanish account data, booked opening/closing balances, dates, economic entry indices and codes. The backend binds the evidence to the original OOXML SHA-256 and verifies the financial plan and physical output before conversion.
Workflow fit
When this route is useful
Generate an .n43 file in AEB modality 1, CP850, fixed 80-byte records with CRLF, for a system that actually accepts this format.
Implementation note
What to expect
The workbook is not first converted to CSV. Spreadsheet row positions are not backend economic entry indices. Do not invent booked statuses, CCC, dates, codes or balances. Formulas, hidden rows, ambiguous sheets or loss of leading zeros may make the original file unrepresentable. Third-party import is not certified; export records 23/24 are not promised.