Greece

type Invoice {
  // ... all generic invoice fields
  lines: [
    { 
      // ...other line item fields
      cpv: string;
    }
  ];
 
  // Recipient is required for regular invoices and not allowed for self-billed invoice
  recipient: {
    contract?: {
      authority: string;
      reference: string;
      type: string;
    };
  };

  customInfo: {
    grc: {
      documentTypeCode;
      incomeClassification: {
        categoryCode: string;
        typeCode: string;
      }
      paymentMethod:[{
        code: string;
      }], 
      series: string;
      qrCode?: string;
    };
  };
};