Auditors and regulators increasingly demand an audit trail that cannot be quietly altered: every edit to a financial document must record who changed it, when, and what the value was before and after — and it must be impossible to switch that logging off. ERPNext core does track document Versions and a Deletion Log, and posted GL Entries are immutable while the ledger is closed, but the native behavior falls short of a defensible statutory trail: version history can be pruned, it is not retained under an enforced schedule, there is no single inspector-ready export mapped to a regulation like India's Companies (Accounts) Rule 3 or Germany's GoBD, and privileged roles can still cancel-and-amend submitted vouchers with little friction. When an auditor asks you to prove the log was always on and never tampered with, the out-of-the-box answer is uncomfortable.

ECOSIRE builds a proper Frappe app that closes that gap. We ship an Audit Trail Log DocType that captures a cryptographically chained record — each entry stores the actor (user), an application-server timestamp, the DocType and document name, the exact field-level before/after values, and a hash of the previous entry so any deletion or edit of a historical row breaks the chain and is detectable. Capture is wired through hooks.py document events (on_update, on_submit, on_cancel, on_trash) plus targeted server scripts on the financial DocTypes you care about — Journal Entry, Sales Invoice, Purchase Invoice, Payment Entry, GL Entry and any custom vouchers — so logging is enforced at the framework layer and cannot be bypassed from the UI or the REST API. Because it runs server-side on document events, an integration that writes through the Frappe REST API or a whitelisted method is captured on exactly the same code path as a desk user.

On top of capture we add the controls a compliance program actually needs. A configurable retention engine (driven by a Retention Policy DocType and a scheduler_events daily job) keeps logs for the statutory period you specify per record class and refuses early deletion. Edit-after-submit lockdown uses role profiles and permission rules plus server-side validation to remove or gate the cancel/amend path on posted vouchers, with an approval-and-reason workflow when a correction is genuinely required. And a whitelisted export method produces an inspector-ready audit report — filterable by date range, DocType, user, and document — as CSV/Excel or a signed PDF, so handing evidence to an auditor is one action rather than a data-extraction project.

Because this is build-to-order, we tailor the covered DocTypes, retention periods, and lockdown rules to your jurisdiction and chart of accounts rather than shipping a generic toggle. After you request a quotation we run a short scoping call, confirm the exact statutory requirement and DocType coverage in writing, then build and test the app on a staging bench against Frappe/ERPNext v15 or v16. Typical delivery is 2-4 weeks from confirmed scope. You get the installable source, a git repository handover, UAT sign-off on staging with a rollback plan, user training, and a post-go-live support window — no marketplace download, no fabricated benchmarks, just a maintainable app your auditors can trust.