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Xero invoice creation failed: Invoice # must be unique.

Xero API 400 error calling CreatePurchaseOrders :{ "ErrorNumber": 10, "Type": "ValidationException", "Message": "A validation exception occurred", "Elements": [ { "PurchaseOrderID": "00000000-0000-0000-0000-000000000000", "PurchaseOrderNumber": "PO26050001", "DateString": "2026-05-06T00:00:00", "Date": "\/Date(1778025600000+0000)\/", "DeliveryDateString": "2026-05-13T00:00:00", "DeliveryDate": "\/Date(1778630400000+0000)\/", "HasErrors": true, "IsDiscounted": false, "TotalDiscount": 0.00, "Reference": "", "Type": "PURCHASEORDER", "CurrencyCode": "AUD", "Contact": { "ContactID": "9310b0d5-e1dc-46f2-aa03-d639797ab239", "ContactStatus": "ACTIVE", "Name": "A class Fencing Solution", "EmailAddress": "", "BankAccountDetails": "", "Addresses": [ { "AddressType": "STREET", "City": "", "Region": "", "PostalCode": "", "Country": "" }, { "AddressType": "POBOX", "City": "", "Region": "", "PostalCode": "", "Country": "" } ], "Phones": [ { "PhoneType": "DEFAULT", "PhoneNumber": "", "PhoneAreaCode": "", "PhoneCountryCode": "" }, { "PhoneType": "DDI", "PhoneNumber": "", "PhoneAreaCode": "", "PhoneCountryCode": "" }, { "PhoneType": "FAX", "PhoneNumber": "", "PhoneAreaCode": "", "PhoneCountryCode": "" }, { "PhoneType": "MOBILE", "PhoneNumber": "", "PhoneAreaCode": "", "PhoneCountryCode": "" } ], "UpdatedDateUTC": "\/Date(1759885847510+0000)\/", "ContactGroups": [], "DefaultCurrency": "AUD", "ContactPersons": [], "HasValidationErrors": false }, "Status": "SUBMITTED", "LineAmountTypes": "Inclusive", "LineItems": [ { "ItemCode": "ACTPFP125125165", "Description": "Treated Pine Fence Paling 125x12x1650", "UnitAmount": 1.5800, "TaxType": "INPUT", "TaxAmount": 718.18, "LineAmount": 7900.00, "AccountCode": "351", "Tracking": [], "Quantity": 5000.0000, "AccountID": "cec0747b-1d3d-4f8b-9289-2e7c7242b729", "ValidationErrors": [] }, { "ItemCode": "ACTPS2005036", "Description": "TREATED PINE SLEEPERS 200x50 - 200x50x3.6", "UnitAmount": 20.4600, "TaxType": "INPUT", "TaxAmount": 3720.00, "LineAmount": 40920.00, "AccountCode": "351", "Tracking": [], "Quantity": 2000.0000, "AccountID": "cec0747b-1d3d-4f8b-9289-2e7c7242b729", "ValidationErrors": [] } ], "SubTotal": 44381.82, "TotalTax": 4438.18, "Total": 48820.00, "ValidationErrors": [ { "Message": "Item code 'ACTPS2005036' is not valid" } ], "Warnings": [ { "Message": "Created from ERP PO 53" } ] } ] }

Invoice INV26040299 has no valid line items

{ "ErrorNumber": 10, "Type": "ValidationException", "Message": "A validation exception occurred", "Elements": [ { "ContactID": "00000000-0000-0000-0000-000000000000", "Name": "T.N.Z Construction", "EmailAddress": "apne2010@gmail.com", "Addresses": [], "Phones": [], "ContactGroups": [], "ContactPersons": [], "HasValidationErrors": true, "ValidationErrors": [ { "Message": "The contact name T.N.Z Construction is already assigned to another contact. The contact name must be unique across all active contacts." } ] } ] }