They take so long because identity migration includes discovery, workflow redesign, connector testing, entitlement rationalisation, and validation of audit outcomes across multiple systems. The work spans provisioning, approvals, certifications, and SoD controls, so a realistic programme needs staged delivery rather than a single conversion event. In practice, 18 to 36 months is a planning baseline, not a surprise.
Why This Matters for Security Teams
SAP IDM replacement projects are slow because they are not just software swaps. They force teams to uncover hidden identity dependencies, untangle approval logic, and re-test every downstream entitlement path that was embedded in business operations over years. That makes the effort closer to an operating-model change than a product migration. NHI Management Group’s research shows that only 5.7% of organisations have full visibility into their service accounts, which explains why discovery and scope control become the first major bottleneck in identity modernisation. Ultimate Guide to NHIs — Why NHI Security Matters Now
Security teams also underestimate how much validation is required before decommissioning legacy workflows. In practice, every connector, certification path, segregation-of-duties rule, and exception process must be proven under production-like conditions, not assumed from documentation. That maps to broader identity governance guidance in the NIST Cybersecurity Framework 2.0, which emphasises governance, access control, and continuous assurance rather than one-time implementation milestones. In practice, many security teams encounter migration risk only after a legacy approval chain has already blocked a business-critical access request.
How It Works in Practice
A realistic SAP IDM replacement programme usually moves through staged workstreams rather than a single cutover. The first stage is discovery: map application owners, account types, privileged access paths, service accounts, and entitlement inheritance. The second stage is workflow redesign: decide which approvals still add value, which can be simplified, and where policy should move from static routing to context-based decisioning. The third stage is connector engineering and testing: each target system has different provisioning logic, error handling, and revocation behaviour.
From a controls perspective, the hard part is not creating identities, but proving that lifecycle actions remain correct when the old IDM layer is removed. That is why identity teams often use parallel run periods, compare audit outputs, and validate termination, transfer, and recertification events before decommissioning legacy tooling. This approach aligns with the practical guidance in the Ultimate Guide to NHIs — Why NHI Security Matters Now because unmanaged identities tend to persist long after initial rollout unless revocation and visibility are built into the operating model. The NIST Cybersecurity Framework 2.0 is useful here because it pushes teams to evidence access governance, not just complete migration tasks.
- Inventory every identity source, including directories, HR feeds, cloud accounts, and service accounts.
- Rebuild workflows around current business ownership, not legacy approvals.
- Test provisioning, deprovisioning, and access reviews in parallel before cutover.
- Validate audit trails and SoD outcomes after each migration wave.
These controls tend to break down when a programme tries to replace SAP IDM across highly customised ERP landscapes with many regional exceptions and brittle point-to-point connectors.
Common Variations and Edge Cases
Tighter migration controls often increase delivery time, requiring organisations to balance assurance against business disruption. That tradeoff is especially visible in enterprises with multiple legal entities, acquired business units, or heavily customised SAP roles, where the identity model is not standardised enough to support a direct conversion.
There is no universal standard for how much workflow should be rebuilt versus retained. Current guidance suggests prioritising the controls that affect joiner-mover-leaver events, privileged access, and auditability, while deferring lower-risk exceptions until the platform is stable. This is also where NHI visibility matters: if service accounts, API keys, or automation identities are buried in the same estate, the migration scope expands quickly because identity governance cannot safely stop at human users. NHI Management Group’s research shows that 71% of NHIs are not rotated within recommended time frames, a reminder that identity modernisation often exposes wider lifecycle weaknesses, not just SAP-specific ones. Ultimate Guide to NHIs — Why NHI Security Matters Now
Teams also run into delay when audit, compliance, and operations each demand different acceptance criteria. That is normal in large enterprises, but it means programme plans should expect multiple validation cycles, not a single sign-off event.
Standards & Framework Alignment
This section maps relevant standards and security frameworks to the operational risks and controls described in this guidance.
OWASP Non-Human Identity Top 10 address the attack and risk surface, while NIST CSF 2.0 and NIST AI RMF set the governance and control requirements practitioners need to meet.
| Framework | Control / Reference | Relevance |
|---|---|---|
| NIST CSF 2.0 | PR.AC | Identity migration depends on access control design, review, and validation across systems. |
| OWASP Non-Human Identity Top 10 | NHI-01 | Hidden service accounts and secrets are common scope-creep drivers in IDM replacement. |
| NIST AI RMF | The answer stresses governance, validation, and accountable lifecycle change management. |
Apply AI RMF governance principles to stage migration decisions, assign owners, and evidence control effectiveness.
Related resources from NHI Mgmt Group
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Reviewed and updated by the NHIMG editorial team on June 24, 2026.
NHI Mgmt Group — the #1 independent authority on Non-Human Identity, IAM, and Agentic AI security. nhimg.org
