| 1 | No substitution allowed Notice to supplier to fill order exactly as specified. |
| 2 | Supply any binding if edition ordered not available Indicates that substitute bindings are acceptable if the edition of a book originally ordered is unavailable. |
| 3 | Supply paper binding if edition ordered not available Indicates that a paper back edition of a book is acceptable if the edition ordered is unavailable. |
| 4 | Supply cloth binding if edition ordered not available Indicates that the cloth bound edition of a book is acceptable if the edition ordered is unavailable. |
| 5 | Supply library binding if edition ordered not available Indicates that a library binding of a book is acceptable if the edition ordered is unavailable. |
| 6 | Equivalent item substitution Indicates that an item of the same value and performance may be substituted for the item specified. |
| 7 | Alternate item substitution allowed Indicates that an item of equal or greater value and performance may be substituted for the item specified. |
| ZZZ | Mutually defined A code reserved for special trading partner requirements when pre-defined codes do not exist. |