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fusion_accounting/fusion_accounting_core/README.md

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+# Fusion Accounting Core
+
+Foundation module for the Fusion Accounting suite.
+
+## What it does
+
+- Defines three security groups: Fusion Accounting User / Manager / Administrator
+- Auto-promotes Odoo `account.group_account_user` -> Fusion User and
+  `account.group_account_manager` -> Fusion Admin
+- Declares schema-preservation fields on `account.move` and `account.reconcile.model`
+  so that Enterprise extension fields (deferred revenue links, signing user, etc.)
+  survive an Enterprise uninstall
+- Exposes the helper `env['ir.module.module']._fusion_is_enterprise_accounting_installed()`
+
+## Install
+
+This module never installs alone. Install `fusion_accounting` (the meta-module)
+or any of the feature sub-modules — they all depend on `fusion_accounting_core`.
+
+## Uninstall
+
+Uninstalling `fusion_accounting_core` will remove the security groups and the
+schema-preservation fields. If Enterprise is also installed, uninstalling
+`fusion_accounting_core` will cause Odoo to consider the deferred / signing
+fields owned only by Enterprise — which is the original Enterprise-only state
+(no data loss, just back to Enterprise-controlled schema).
+
+## Troubleshooting
+
+If users are missing the "Fusion Accounting" privilege section in user settings
+after install, the `implied_ids` mechanism only fires for newly-added users.
+Backfill existing users via SQL:
+
+    INSERT INTO res_groups_users_rel (gid, uid)
+    SELECT g.res_id, gu.uid
+    FROM res_groups_users_rel gu
+    JOIN ir_model_data g ON g.module = 'fusion_accounting_core' AND g.name = 'group_fusion_accounting_user'
+    JOIN ir_model_data ag ON ag.module = 'account' AND ag.name = 'group_account_user' AND gu.gid = ag.res_id
+    ON CONFLICT DO NOTHING;