[CL] Related Documents (relations)

Overview

A Chilean DTE can carry references to other documents (SII Referencias). Large buyers often match each invoice against their purchase order (OC) or service entry sheet (HES), and an invoice without the reference they expect can be held at payment.

In Brinta you send these references in the root-level relations[] array. Each entry produces one reference in the XML:

Brinta field	Required?	SII XML element	Notes
`relations[].document_type`	Required	`TpoDocRef`	See the table below.
`relations[].invoice_type`	Required	(Brinta-only)	See the table below.
`relations[].invoice_number`	Required	`FolioRef`	Number of the referenced document.
`relations[].invoice_date`	Required	`FchRef`	Format `YYYY-MM-DD`.
`relations[].relation_reason`	Optional	`RazonRef`	Free text.

You can send several relations in the same document, for example an OC and an HES.

Credit and debit notes keep the reference to the original invoice (original_invoice_id / original_invoice_external_id); any relations[] you send are added to it.

Document types

`document_type`	`invoice_type`	SII code	Name shown on the document
`purchase order`	`debit`	801	Orden de Compra
`service entry sheet`	`debit`	HES	Hoja de Entrada Servicio
`order note`	`debit`	802	Nota de pedido
`contract`	`support_document`	803	Contrato
`resolution`	`support_document`	804	Resolución
`chile compra process`	`support_document`	805	Proceso Chile Compra
`chile compra record`	`support_document`	806	Ficha Chile Compra
`export customs declaration`	`transport`	807	DUS
`bill of lading sea`	`transport`	808	B/L (Conocimiento de embarque)
`bill of lading air`	`transport`	809	AWB (Air Waybill)
`export transport`	`transport`	810	MIC/DTA
`bill of lading road`	`transport`	811	Carta de Porte
`customs export resolution`	`transport`	812	Resolución del SNA donde califica Servicios de Exportación
`exchange deposit certificate`	`support_document`	814	Certificado de Depósito Bolsa Prod. Chile
`exchange pledge voucher`	`support_document`	815	Vale de Prenda Bolsa Prod. Chile
`exceptional payment term agreement`	`support_document`	820	Código de Inscripción en el Registro de Acuerdos con Plazo de Pago Excepcional
`transport`	`transport`	52	Guía de Despacho Electrónica

To reference a DTE already issued through Brinta (for example, an invoice from a previous month), send only invoice_id or invoice_external_id plus relation_reason: Brinta takes the SII code, folio and date from that document.

Example — Invoice referencing an OC and an HES

{
  "e_invoice": true,
  "currency": "CLP",
  "supplier_company_id": "{{supplier_company_id}}",
  "invoice_date": "2026-10-21",
  "document_type": "invoice",
  "invoice_type": "debit",
  "invoice_external_id": "{{invoice_external_id}}",
  "buyer": {
    "company": {
      "legal_name": "Buyer Company SpA",
      "type": "business",
      "address": {
        "address_line_1": "Av. Apoquindo 1234",
        "neighborhood": "Las Condes",
        "city": "Santiago",
        "country": "CL"
      },
      "tax_registrations": [
        {
          "number": "77000000-0",
          "type": "RUT",
          "level": "country",
          "location": "CL"
        }
      ]
    }
  },
  "items": [
    {
      "name": "Maintenance service",
      "quantity": 1,
      "amount": 100000,
      "taxes": [
        {
          "name": "IVA",
          "type": "VAT",
          "rate": 0.19,
          "rate_type": "percentage",
          "amount": 19000
        }
      ]
    }
  ],
  "relations": [
    {
      "document_type": "purchase order",
      "invoice_type": "debit",
      "invoice_number": "4500265361",
      "invoice_date": "2026-09-15"
    },
    {
      "document_type": "service entry sheet",
      "invoice_type": "debit",
      "invoice_number": "{{hes_number}}",
      "invoice_date": "{{hes_date}}",
      "relation_reason": "HES {{hes_number}}"
    }
  ]
}

Resulting SII references:

TpoDocRef	FolioRef	FchRef	RazonRef
801	4500265361	2026-09-15
HES	`{{hes_number}}`	`{{hes_date}}`	HES {{hes_number}}

Check with your buyer which reference they expect. Most buyers ask for the OC (801), and some also ask for the HES. Use the number exactly as it appears in the buyer's system.