{
  "calculate_field": [
    ["por_purchase_price_total", "+"],
    ["por_purchase_price_total", "-"],
    ["por_purchase_price_total", "*"],
    ["por_vat_price", "+"],
    ["por_vat_percentage", ""],
    ["por_price_total", "+"],
    ["purchase_price_total_vat", "+"]
  ],
  "subtotal": [
    {
      "field": "po_purchase_order_id",
      "formula": null,
      "page_break": true
    }
  ],
  "total": {
  }
}
