436 Reference Usage Code
Code indicating type of external reference
- Type
 - Identifier (ID)
 - Length
 - Min 2 / Max 2
 - Codes
 | Code | Description | 
|---|
|  BR | Backward Reference | 
|  DR | Division Reference | 
|  GR | Group Reference | 
|  OP | Other Publication | 
|  RR | Rate Reference | 
|  TP | Tariff Publication |