When migration teams underweight data mapping and access controls, they risk broken transactions, inconsistent records, and inappropriate authorization in the target system. Legacy customisations can also carry forward hidden privilege and segregation issues. The result is delayed go-live, unreliable reporting, and a higher chance that users can see or change data they should not.
Why This Matters for Security Teams
SAP transformation projects fail in predictable ways when migration planning treats data mapping as a purely technical copy exercise and access control as a later cleanup task. In reality, the target system inherits business meaning, authorization logic, and exception handling from the source. If those elements are not reconciled together, teams can move data successfully while still breaking transactions, approvals, reporting, and segregation of duties.
This is also where legacy customisations become dangerous. A field that looked harmless in the source may drive workflow, posting logic, or privilege checks in the target. Security teams should review this through the lens of identity and access governance, not just cutover mechanics, using guidance from OWASP Non-Human Identity Top 10 and NIST SP 800-53 Rev 5 Security and Privacy Controls. NHIMG notes that 97% of NHIs carry excessive privileges, which is a reminder that migration can amplify privilege problems if mappings are inaccurate and account models are copied forward without challenge, as covered in the Ultimate Guide to NHIs.
In practice, many security teams encounter access drift and broken finance or procurement workflows only after users have already started testing the new landscape.
How It Works in Practice
The safest migration approach starts by mapping data and access together. For each business object, teams need to know where the data originates, how it transforms, which roles touch it, and what authorization checks apply at each step. That means pairing data lineage work with role engineering, field-level security review, and reconciliation of derived permissions, rather than running these tracks separately.
Practitioners often use a three-layer model:
- Source-to-target data mapping to preserve referential integrity, code values, and workflow dependencies.
- Role and entitlement mapping to translate legacy access into the target system’s authorization design.
- Control validation to test whether users can execute the right transaction, on the right record, for the right reason.
This is especially important when SAP custom objects, interface accounts, background jobs, and service identities are involved. Those identities often behave like non-human identities and should be treated accordingly, with review of secret handling, rotation, and least privilege. The Ultimate Guide to NHIs — Key Challenges and Risks and the Ultimate Guide to NHIs — Key Research and Survey Results both reinforce why hidden privileges and weak visibility become migration blockers, not just post-go-live cleanup items. For implementation discipline, align the work with CIS Controls v8 for access control management and ISO/IEC 27001:2022 Information Security Management for governance and control ownership.
Controls tend to break down when custom SAP logic, shared service accounts, and incomplete role inventories collide during parallel run because test coverage rarely exercises the full authorization path.
Common Variations and Edge Cases
Tighter access control during migration often increases project overhead, requiring organisations to balance speed against the risk of inheriting bad entitlements. That tradeoff is real, especially when programmes face fixed cutover dates and incomplete source documentation.
Some edge cases deserve special handling. Cross-company code migrations, carve-outs, and process redesigns can invalidate old roles entirely, so a straight mapping may be worse than a controlled redesign. Similarly, “temporary” emergency access often becomes permanent if it is not designed out before go-live. Current guidance suggests treating these as exceptions with explicit approval, expiry, and post-cutover review, rather than assuming they can be normalised later.
One NHIMG case study worth reviewing is the SAP SQL Anywhere Monitor Hardcoded Credentials example, which shows how SAP-adjacent environments can carry insecure access patterns forward when teams focus only on functional migration. For broader breach patterns, the 52 NHI Breaches Analysis is useful context. Best practice is evolving, but the direction is clear: map access as carefully as data, challenge inherited privilege, and validate authorization with business owners before cutover, not after auditors find the gap.
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 and CSA MAESTRO address the attack and risk surface, while NIST AI RMF, NIST CSF 2.0 and NIST SP 800-63 set the governance and control requirements practitioners need to meet.
| Framework | Control / Reference | Relevance |
|---|---|---|
| OWASP Non-Human Identity Top 10 | NHI-01 | Migration can copy risky non-human identities and privileges into SAP. |
| CSA MAESTRO | Agentic and automated migration tasks need workload-aware governance. | |
| NIST AI RMF | AI RMF helps govern automated decisions during migration planning and testing. | |
| NIST CSF 2.0 | PR.AC-4 | Access management is directly affected when roles are remapped in the target system. |
| NIST SP 800-63 | Identity proofing and authenticator assurance inform account lifecycle decisions. |
Inventory service accounts and API keys before cutover, then reissue only the access each workload truly needs.
Related resources from NHI Mgmt Group
- How should organisations manage access risk during Oracle ERP Cloud migration and transformation projects?
- What breaks when access controls are designed too late in a cloud transformation programme?
- How should security teams implement policy-based access controls for ERP systems that contain sensitive personal and financial data?
- What breaks when SAP code is modified directly instead of using extensibility and transport controls?
