0..n| Id | Business Term | Card. | Definition |
|---|---|---|---|
| IBT-122 | Supporting document reference | 1..1 | An identifier of the supporting document. |
| IBT-123 | Supporting document description | 0..1 | A description of the supporting document. |
| IBT-124 | External document location | 0..1 | The URL (Uniform Resource Locator) that identifies where the external document is located. |
| IBT-125 | Attached document | 0..1 | An attached document embedded as binary object or sent together with the invoice. |