| Code | code | cbc.Code | | Identifier assigned by the customer or buyer for internal routing purposes. |
| Identities | identities | array of org.Identity | | Any additional Codes, IDs, SKUs, or other regional or custom identifiers that may be used to identify the order. |
| Cost | cost | cbc.Code | | Buyer accounting reference cost code associated with the document. |
| Period | period | cal.Period | | Period of time that the invoice document refers to often used in addition to the details provided in the individual line items. |
| Buyer | buyer | org.Party | | Party who is responsible for issuing payment, if not the same as the customer. |
| Seller | seller | org.Party | | Seller is the party liable to pay taxes on the transaction if not the same as the supplier. |
| Projects | projects | array of org.DocumentRef | | Projects this invoice refers to. |
| Contracts | contracts | array of org.DocumentRef | | The identification of contracts. |
| Purchase Orders | purchases | array of org.DocumentRef | | Purchase orders issued by the customer or buyer. |
| Sales Orders | sales | array of org.DocumentRef | | Sales orders issued by the supplier or seller. |
| Receiving Advice | receiving | array of org.DocumentRef | | Receiving Advice. |
| Despatch Advice | despatch | array of org.DocumentRef | | Despatch advice. |
| Tender Advice | tender | array of org.DocumentRef | | Tender advice, the identification of the call for tender or lot the invoice relates to. |
