{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "$id": "#/components/schemas/PurchaseOrderDetail",
  "title": "PurchaseOrderDetail",
  "allOf": [
    {
      "$ref": "#/components/schemas/PurchaseOrder"
    },
    {
      "type": "object",
      "properties": {
        "lines": {
          "type": "array",
          "items": {
            "$ref": "#/components/schemas/PurchaseOrderLine"
          }
        }
      }
    }
  ]
}