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+# Q4 2025 ERP Migration Runbook
+
+**Document ID**: RB-MIG-2025-Q4
+**Version**: 3.1
+**Last Updated**: 2025-09-24
+**Classification**: Internal Use Only
+
+---
+
+## 1. Executive Summary
+
+This runbook documents the migration of master data from LEGACY_ERP to SAP_TC2
+as part of the legacy system decommission initiative. The migration covers products,
+suppliers, and legal entities currently maintained in the legacy platform.
+
+## 2. Migration Scope
+
+### 2.1 Systems Involved
+
+| System | Role | Status |
+|--------|------|--------|
+| LEGACY_ERP | Source (decommission) | Active until Q4 2025 |
+| SAP_TC2 | Primary target | Production |
+| SAP_CFIN | Financial consolidation | Receiving updates |
+| SAP_APAC | APAC regional | Subset migration |
+
+### 2.2 Entity Scope
+
+- Products: ~80 active records in LEGACY_ERP
+- Suppliers: ~20 active vendor records
+- Legal entities: ~10 subsidiary records
+
+## 3. Migration Methodology
+
+### 3.1 Naming Convention Mapping
+
+LEGACY_ERP uses cryptic internal codes that must be mapped to SAP_TC2 formal names.
+The mapping follows these patterns:
+
+- Legacy codes with prefix `STR-` correspond to starch products in TC2
+- Legacy codes with prefix `SUG-` correspond to sugar products in TC2
+- Legacy codes with prefix `ACD-` correspond to acid products in TC2
+- Legacy codes with prefix `PRT-` correspond to protein products in TC2
+- Legacy codes with prefix `OIL-` correspond to oil & fat products in TC2
+
+### 3.2 Completed Migrations
+
+The following entities have been migrated and verified:
+
+- `ZINCOXID` (LEGACY_ERP) was migrated to `Zinc Oxide Food Grade` in SAP_TC2. Verified by data steward.
+- `STR-005` (LEGACY_ERP) was migrated to `Modified Corn Starch` in SAP_TC2. Verified by data steward.
+- `sugar product 889` (LEGACY_ERP) was migrated to `Sorbitol Powder` in SAP_TC2. Verified by data steward.
+- `FBR-130` (LEGACY_ERP) was migrated to `Chicory Root Fiber` in SAP_TC2. Verified by data steward.
+- `product 636` (LEGACY_ERP) was migrated to `Disodium 5-Ribonucleotides` in SAP_TC2. Verified by data steward.
+
+### 3.3 Pending Migrations
+
+The remaining legacy entities are pending manual review before migration.
+Contact the migration team for status updates.
+
+## 4. APAC Regional Considerations
+
+SAP_APAC uses abbreviated naming conventions. When cross-referencing with TC2:
+- APAC product codes use shortened forms (e.g., 'Malto-Dex' instead of full product names)
+- APAC supplier names may use regional abbreviations
+- Not all TC2 products have APAC equivalents — only APAC-relevant products are maintained
+
+## 5. SAP_CFIN Integration
+
+SAP_CFIN uses internal financial codes that differ from TC2 product names.
+Common patterns:
+- `Product NNNN` — numeric product identifiers in CFIN
+- `MAT-NNNNN` — material codes for raw materials
+- `ING-NNNNN` — ingredient codes
+- `RM-NNNNN` — raw material codes
+
+These codes are mapped to TC2 entities via the product crosswalk table.
+
+## 6. Rollback Procedures
+
+In case of migration failure:
+1. Restore LEGACY_ERP from backup
+2. Revert SAP_TC2 changes using migration journal
+3. Notify downstream systems
+
+---
+
+*This document is maintained by the Migration Team. Contact migration-team@company.com*