Who is accountable for access risk during an SAP IDM migration?

Why This Matters for Security Teams

SAP IDM migrations create a temporary but high-stakes overlap between the old access model and the new one. That overlap is where accountability becomes blurred: provisioning, deprovisioning, role mapping, and certification evidence can all shift at once. Current guidance suggests treating the migration as a shared control transition, not a simple platform swap, because access risk changes as much as the technology does. The Ultimate Guide to NHIs shows why this matters in practice, especially when access paths and secrets are already distributed across systems.

Security teams often get this wrong by assuming the new IAM owner can absorb the risk on day one. In reality, SAP security, identity governance, application owners, and audit all hold pieces of the control chain until the legacy IDM is fully retired. The NIST Cybersecurity Framework 2.0 reinforces the need for explicit ownership, monitoring, and recovery planning during change. In practice, many security teams encounter access risk only after orphaned accounts or failed certifications surface during cutover, rather than through intentional transition governance.

How It Works in Practice

Accountability during an SAP IDM migration should be assigned by control domain, not by system label. Identity owners remain accountable for lifecycle policy, application owners for business authorization logic, SAP security for platform configuration and transport impact, and governance teams for evidence, exception handling, and certification closure. That shared model matters because migration can break the link between who can approve access and who can prove it was approved.

Practitioners usually manage this by defining a cutover RACI, a parallel-run period, and a formal retirement gate. During the parallel period, both platforms may issue or validate access, but the business must still know which system is authoritative for each control. Useful checkpoints include:

• Who owns role redesign and segregation-of-duties conflicts
• Who approves offboarding and emergency removals
• Who validates certification completeness before legacy shutdown
• Who signs off on residual access exceptions and compensating controls

For migration teams, the main risk is not only technical drift but evidence drift. If access reviews are run in one system while entitlements are still active in another, audit evidence becomes fragmented and remediation gets delayed. The Ultimate Guide to NHIs — Key Challenges and Risks is useful here because it highlights how unfinished lifecycle control creates lasting exposure. The OWASP Non-Human Identity Top 10 also aligns to this problem where credentials, service accounts, and integrations survive a migration longer than intended. These controls tend to break down when the cutover spans multiple business units because no single owner can see all access paths at once.

Common Variations and Edge Cases

Tighter migration governance often increases coordination overhead, requiring organisations to balance delivery speed against auditability and control certainty. That tradeoff becomes sharper when SAP IDM is feeding downstream applications, because local exceptions may outlive the central migration plan. Best practice is evolving here, but current guidance suggests keeping accountability explicit until the last entitlement, certification, and exception is retired.

There are a few common edge cases. If a third-party implementation partner is running the migration, they may execute tasks, but they should not own access risk acceptance. If the legacy IDM and target IAM platform both remain active, ownership must be mapped to the control being exercised, not the tool being used. If business units manage delegated approvals, then governance must verify that approvals still match policy during the transition.

NHIMG research indicates why this discipline matters: the 52 NHI Breaches Analysis and the Ultimate Guide to NHIs — Why NHI Security Matters Now both reinforce that identity control failures persist when ownership is unclear. In short, the cleanest answer is shared accountability with named control owners and a single retirement date, because migration risk rarely ends when the software switch is flipped.

Related resources from NHI Mgmt Group

• Who should be accountable for SAP IDM sunset migration decisions?
• Who is accountable when access governance gaps appear during digital transformation?
• When does JIT access create more risk than it reduces?
• How should security teams govern SAP access during an S/4HANA migration?