- Invoicing
The unbroken number series, and the four ways software breaks it
Bokföringslagen asks for a series with no holes and a document reproducible for seven years. Four ordinary implementation choices quietly break both. Here they are, and what to do instead.
Aug 27, 2026 · 9 min
- Bookkeeping
The SIE4 file your accountant opens, and the two ways it usually arrives broken
SIE4 is CP437, not UTF-8, and one voucher that does not balance makes an accounting package refuse the whole file. Two vouchers worked out in full, including a ROT invoice.
Jun 11, 2026 · 10 min