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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*