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accounted/scripts/api-skill/overlays/gotchas.md
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Gotchas (Swedish accounting domain)

Rules a generic REST integration will violate unless told:

  • Account numbers are strings, not numbers. BAS accounts ("1930", "3001") are identifiers; send them as JSON strings. Arithmetic on them, zero-stripping, or number coercion corrupts postings.
  • Posted journal entries are immutable by law (Bokföringslagen). There is no PATCH or DELETE on a committed entry, ever. Undo with POST .../journal-entries/{id}/reverse (storno), fix with POST .../journal-entries/{id}/correct. Design flows around reverse-and-repost, not edit-in-place.
  • Voucher numbers are gapless and server-assigned. Never assume or pre-allocate one; read it from meta.audit.voucher_number after commit. A legally required gap explanation goes through POST .../voucher-gap-explanations.
  • Every entry balances. sum(debit) === sum(credit) to the öre, amounts are decimal SEK numbers (max 2 decimals). Do rounding with round-half-away-from-zero on öre; never float-accumulate line totals client-side and "fix" the difference on a random line.
  • Period locks are a feature, not an error to retry. Writes into a locked/closed period return PERIOD_LOCKED (with valid_alternatives pointing at open periods). Retrying the same request cannot succeed; either target an open period or surface the lock to the user.
  • Drafts vs posted. Invoices are created as drafts with invoice_number: null; the F-series number is assigned atomically on send. Journal entries follow draft -> commit. Nothing financial exists in the ledger until the commit/send action.
  • Two invoice worlds. invoices = accounts receivable (you bill customers); supplier-invoices = accounts payable (you receive bills). They are different resources with different lifecycles.
  • Swedish user-facing text. error.message is Swedish by design; show it to Swedish end users, and use message_en for your own logs/logic. Domain terms in responses (moms, verifikat, kostnadsställe) are not translatable labels but legal concepts.
  • Compliance pre-flight. Before building your own validation for Swedish rules, call GET .../compliance/check: it runs the server's own rule set (VAT plausibility, sequence integrity, period status) and returns findings.