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The per-module Gl*Code appsettings keys pinned GL's account *codes* in ERPCore's config, while GL generates codes positionally and refuses a requested one. Nothing connected the two, so "1100 means Inventory" held only because someone once created accounts in a particular order - and on 2026-10-07 eleven of the twelve configured codes turned out never to have existed in GL. Every GRN, adjustment, day-end, invoice and FIFO posting had been failing with "Account <code> not found". The mapping is now master data in gl_account_config, keyed by accounting role rather than by module, and GlAccountConfigService validates every submitted code against GL's live chart of accounts before storing it. A code GL does not have, or cannot post to, is refused with the role named - so the mismatch is unrepresentable rather than merely detected. Correcting a mapping no longer needs a redeploy. Notes: - Fails closed on save (503 if GL is unreachable), deliberately opposite to the startup validator, which must still let the app serve. - Non-postable accounts are rejected too: GL rejects a journal line against one, so storing it only defers the failure. The auto-created 1000 Bank/Cash header is exactly that trap. - The settings endpoint also serves the selectable accounts, because GeneralLedgerController is gated on `ledgers` while this is on `settings` - and it keeps the picker and the validation list the same data. - Reading an unmapped role throws naming the role, instead of posting "" and letting GL return an opaque 404 from inside a transaction. - The appsettings keys are now seed-only: DataSeeder copies them in once so existing deployments keep their current mapping. No runtime fallback, or there would be two sources of truth again. - The 32 read sites across 11 services collapsed to 12 roles, since every module carried the same value for a given role. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>