| AdditionalInfo | Identifies additional information for an extra. E.g. "Large", "Medium" or "Small" frame for a mountain bike. |
| Description | A description of the extra. |
| Name | The extra amenity name. |
| OtherCode | The trading partner code that uniquely identifies the extra and is associated with the supplier code. |
| Quantity | The quantity of extras being requested. |
| ReserveInd | If true, a reservation for this this extra is requested. |
| SupplierCode | The supplier code that uniquely identifies the extra. |
| GroupID | A unique ID (that is assigned elsewhere in the message) that associates a group with other information. |
| ParticipantCategoryID | A unique ID (that is assigned elsewhere in the message) that associates a participant category with other information. |
| ParticipantID | A unique ID (that is assigned elsewhere in the message) that associates a participant with other information. |