{"invoice":{"issuer":{"vatNumber": "000000000","branch": 0,"country": "GR"},"counterpart":{"vatNumber": "","branch": 0,"name": "","country": "GR",},"publishType": 1,"invoiceHeader": {"series": "","aa": "","issueDate": "","invoiceType": "2.1","invoiceTypeUbl": "380","paymentTerms": "Μέσω κατάθεσης σε τραπεζικό λογαριασμό","currency": "EUR" },"invoiceDetails": [{"quantity": 1,"entityName": "","netValue": ,"vatCategory": 7,"vatCategoryUbl": "E","vatExemption": 7,"vatExemptionUbl": "VATEX-EU-132","vatAmount": 0,"vatPercent": ,"measurementUnit": 1,"measurementUnitUbl": "E48","classificationCategory": "","classificationType": ""}],"paymentMethods": [{"type": "","amount": "",}],"invoiceSummary": {"totalNetValue": 0.00,"totalVatAmount": 0.00,"totalValue": 0.00,},"Messages": [{"type": 0,"recipients": "kontakis@gmail.com","cc": "kontakis@uom.edu.gr","templateIdentifier": "000002" }]}}<br><br>Error: Απαιτείται ExternalSystemID. Ένα αναγνωριστικό του παραστατικού που καθορίζεται από τον χρήστη. 00010002<br>