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e2f1b37 | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 | # Procedure: Commodity Trading — Variant 29
(Variant for commodity_trading domain)
## Legal Entity Identifier (LEI)
The LEI is a 20-character alphanumeric code that uniquely identifies
legal entities participating in financial transactions.
## Cross-System Matching Rules
- LEI is the gold standard for counterparty matching
- When LEI is unavailable, use: Tax ID > SWIFT BIC > Name + Jurisdiction
- Name-only matching has high false positive rate (30%+)
## Common Issues
- Same counterparty with different LEI branches
- Subsidiary vs parent entity confusion
- Post-merger LEI transitions (old LEI remains in legacy systems)
- Sanctioned entities with name variations
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