* fix(supplier-invoices): warn on class 1/6 accounts for reverse charge lines (#863)
Item 2 of #863: when omvand skattskyldighet is on, lines booked on an
account starting with 1 (assets) or 6 draw a non-blocking warning banner
in the Kontering card naming the rows; reverse charge purchases normally
sit on 4xxx/5xxx cost accounts. Advisory only, since class 6 has
legitimate reverse charge uses (e.g. 6540 IT-tjanster for EU cloud
services), so submission is never blocked.
Item 1 (block VAT rates outside the legal set 25/12/6/0) already shipped
in PR #902; this change extracts that check plus the new one into a pure
tested helper, lib/vat/supplier-invoice-line-checks.ts, which is now also
the single source for the legal rate list used by the VAT rate preset
dropdown.
Item 3 (confirming the reason for a 0 % rate) is deferred: it is a UX
design question, not a validation gap.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
* docs(vat): note food-rate transition dates above LEGAL_VAT_RATES
Compliance-bot finding on PR #1034: the allow-list comment now records
that livsmedel moved 12 % to 6 % on 1 April 2026 (Prop. 2025/26:55,
ML 2023:200) and that the reduction is legislated to revert after
31 December 2027, when 6 % stays legal for books/transport but stops
being the food rate. The static list cannot express per-category
temporal validity; revisit at the reversion. Comment-only change.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
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Co-authored-by: Claude Fable 5 <noreply@anthropic.com>
Jakob Wennberg
a95872928e