| 1 | Additional identification Information which specifies and qualifies product identifications. |
| 2 | Identification for potential substitution The item number describes the potential substitute product. |
| 3 | Substituted by The given item number is the number of the product that substitutes another one. |
| 4 | Substituted for The given item number is the number of the original product substituted by another. |
| 5 | Product identification The item number is for product identification. |
| 6 | Successor product id Product id of the product that will follow the one currently in production/trade. |
| 7 | Predecessor product id Product id of the predecessor of the product currently in production/trade. |
| 8 | Expired/out of production The given item number is the expired item number of the product. It has been replaced. |
| 9 | Deletion of secondary identification Code indicating the deletion of a secondary identification. |
| 10 | Defective part's identification Identification of a defective part. |
| 11 | Repaired part's identification Identification of a repaired part. |
| 12 | Alternate product identification Alternate number to identify the product. |