To identify an external reference
| Position | Element | Name | Type | Min/Max | Repeat | |
|---|---|---|---|---|---|---|
| 1 | 436  | Primary Publication Authority Code | Mandatory | ID | 2/2 | AtMax 1 | 
| 2 | 168  | Tariff Agency Code | Mandatory | ID | 1/4 | AtMax 1 | 
| 3 | 171  | Tariff Number | Mandatory | Alphanumeric | 1/7 | AtMax 1 | 
| 4 | 493  | Tariff Number Suffix | Opt | Alphanumeric | 1/2 | AtMax 1 | 
| 5 | 173  | Tariff Supplement Identifier | Opt | Alphanumeric | 1/4 | AtMax 1 | 
| 6 | 172  | Tariff Section Number | Opt | Alphanumeric | 1/2 | AtMax 1 | 
| 7 | 169  | Tariff Item Number | Opt | Alphanumeric | 1/16 | AtMax 1 | 
| 8 | 128  | Reference Identification Qualifier | Rel | ID | 2/3 | AtMax 1 | 
| 9 | 127  | Reference Identification | Rel | Alphanumeric | 1/80 | AtMax 1 | 
| 10 | 140  | Standard Carrier Alpha Code | Rel | ID | 2/4 | AtMax 1 | 
| 11 | 697  | Docket Control Number | Rel | Alphanumeric | 1/7 | AtMax 1 | 
| 12 | 690  | Docket Identification | Rel | Alphanumeric | 1/11 | AtMax 1 | 
| 13 | 691  | Revision Number | Opt | Number | 1/4 | AtMax 1 | 
| 14 | 260  | Group Title | Opt | Alphanumeric | 2/30 | AtMax 1 |