The short answer
Decommission the source PMS only after confirming required records and reports are preserved and retrievable, reconciliations and acceptance are complete, residual integrations and scheduled jobs are retired, users and credentials are removed, contractual and retention decisions are approved, and a named archive or recovery owner can answer future questions.
Operational checklist
Mark your progress, then save a working copy. Selections reset when you leave this page. A checked box is not an approval or evidence of completion.
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Residual source uses inventoried
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Target acceptance and first-cycle evidence complete
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Archive scope and retrieval tested
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Integrations and scheduled jobs retired
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Users and credentials reconciled
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Contract/retention decisions approved
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Shutdown evidence and archive owner retained
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Key takeaways
- Read-only is a controlled phase, not automatic retirement.
- An export is useful only if it can be interpreted and retrieved.
- Prove residual writers and integrations are gone before cancellation.
Inventory every reason the source still exists
List unresolved defects, rollback dependencies, historical reports, ledger detail, documents, audit logs, communication history, open transactions, tax or legal retention questions, integrations, scheduled jobs, exports, API consumers, users, vendor support, and contract dates.
GAO guidance identifies archive decisions and post-go-live actions as migration practices. Retention and contractual requirements still need qualified, organization-specific review.
Require independent acceptance gates
One project manager should not infer every domain is ready from a quiet help desk.
| Gate | Acceptance evidence | Blocker example |
|---|---|---|
| Operational | Target workflows and open items accepted | Staff still consult source for current work |
| Financial | Required balances/reports reconciled | First close remains unresolved |
| Records | Archive population, metadata, and retrieval test | Attachments exported without relationships |
| Technical | Jobs, webhooks, feeds, and APIs retired | Source can still send or receive writes |
| Access/security | Users, tokens, shared links, and vendor access closed | Former user retains read access |
| Commercial/retention | Contract, preservation, and disposal decisions approved | Cancellation would remove required records |
Execute shutdown as a reversible checklist where possible
Create final exports and integrity evidence, run retrieval samples, disable writers and integrations, revoke credentials, capture final configuration and support contacts, follow approved retention and disposal decisions, and obtain domain sign-offs. Preserve the exact shutdown time and vendor confirmation.
After decommissioning, monitor for failed dependent jobs, missing report requests, or access attempts. A late dependency becomes an incident or archive exception, not a reason to recreate uncontrolled source access.
Edge cases
- The vendor offers only a proprietary archive: test access and export before cancellation.
- One unresolved tax or legal record class exists: keep the required boundary under qualified review.
- Rollback credentials are still active after the window: revoke them through the approved decision.
Sources and references
Follow each source to check the underlying claim. Access checks and professional review are different steps.
1. Primary source · U.S. Government Accountability Office
Financial Management Systems: DHS’s Modernization Plans Should Fully Incorporate Key PracticesMigration leading practices include cutover planning, reconciliation, post-conversion cleanup, archival decisions, and documented post-go-live actions. This is not a property-management mandate.
Source checked 2026-09-18
Automated source-access check: 2026-09-18.
Continue the workflow
PMS migration rollback planHistorical report comparability after a PMS migrationIntegration credential rotation after PMS cutoverRevision history
2026-09-18
Initial Phase 4 operational article with a distinct evidence artifact, failure states, source limits, and AI-assisted technical review.