# 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