Hi,    We have tried to create a Supplier Invoice type DebitAdj (Purchase Credit Note) through POST service API (/controller/api/v1/supplierInvoice) but we can’t , we have sending request  according with api documentation.    This is our test scenery:    This is the Json request we sent:      {"documentTypeId":      {"value":"DebitAdj"},  "supplierNumber":      {"value":"49998"},  "supplierReference":      {"value":"Tollvesenet innførsels mva (Alti"},  "referenceNumber":      {"value":""},  "paymentRefNo":      {"value":""},  "currencyId":      {"value":"NOK"},  "postPeriod":       {"value":"082020"},  "description":      {"value":""},  "date":      {"value":"2020-08-20"},  "invoiceLines":[          {"subaccount":[              {"segmentId":1,"segmentValue":"100"},              {"segmentId":2,"segmentValue":"3000"}],          "transactionDescription":{"value":""},          "operation":"Insert",          "vatCodeId":{"value":"88"},          "accountNumber":{"value":"4300"},          "costInCurrency":{"value":1000}}      ]  }    This is the Json Response where you can see that the created invoice has an invalid document type “”        Json Response    {      "taxDetailLines": [          {              "taxId": "17L",              "vatRate": 20.000000,              "taxableAmount": 1000.0000,              "vatAmount": 200.0000          }      ],      "invoiceLines": [          {              "lineNumber": 1,              "transactionDescription": "",              "quantity": 0.000000,              "unitCost": 0.000000,              "unitCostInCurrency": 0.000000,              "cost": 1000.0000,              "costInCurrency": 1000.0000,              "discountPercent": 0.000000,              "discountAmount": 0.0000,              "discountAmountInCurrency": 0.0000,              "manualDiscount": false,              "account": {                  "type": "Expense",                  "number": "4300",                  "description": "Innkj. varer for videresalg"              },              "subaccount": {                  "subaccountNumber": "1003000",                  "subaccountId": 128,                  "description": "None",                  "lastModifiedDateTime": "2020-08-05T15:13:15.643",                  "active": true,                  "segments": [                      {                          "segmentId": 1,                          "segmentDescription": "Avdeling",                          "segmentValue": "100",                          "segmentValueDescription": "Norway"                      },                      {                          "segmentId": 2,                          "segmentDescription": "Prosjekt",                          "segmentValue": "3000",                          "segmentValueDescription": "Send"                      }                  ]              },              "vatCode": {                  "id": "88",                  "description": "Tjenester kjøpt fra utlandet med fradrag for mva. lav sats"              },              "branchNumber": {                  "number": "1",                  "name": "Compello AS #ISV"              },              "note": "",              "project": {                  "id": "X",                  "description": "Non-Project Code."              },              "attachments": [],              "retainagePct": 0.000000,              "curyRetainageAmt": 0.0000          }      ],      "hold": false,      "exchangeRate": 1.00000000,      "paymentRefNo": "",      "creditTerms": {          "id": "18D",          "description": "18. denne måned"      },      "retainageApply": false,      "cashDiscountDate": "2020-09-18T00:00:00",      "detailTotal": 1000.0000,      "detailTotalInCurrency": 1000.0000,      "discountTotal": 0.0000,      "discountTotalInCurrency": 0.0000,      "vatTaxableTotal": 0.0000,      "vatTaxableTotalInCurrency": 0.0000,      "vatExemptTotal": 0.0000,      "vatExemptTotalInCurrency": 0.0000,      "withholdingTax": 0.0000,      "withholdingTaxInCurrency": 0.0000,      "roundingDiff": 0.0000,      "roundingDiffInCurrency": 0.0000,      "taxCalculationMode": "TaxSetting",      "supplierTaxZone": {          "id": "14",          "description": "Innførsel avgiftspliktig (Tollverket - Altinn)",          "defaultVatCategory": "81"      },      "paySelected": false,      "curyRetainageTotal": 0.0000,      "curyRetainageUnreleasedAmt": 0.0000,      "supplier": {          "number": "49998",          "name": "Tollvesenet innførsels mva (Altinn)"      },      "documentType": "Invoice",      "referenceNumber": "200129",      "postPeriod": "082020",      "financialPeriod": "202008",      "date": "2020-08-20T00:00:00",      "origInvoiceDate": "2020-08-20T00:00:00",      "dueDate": "2020-09-18T00:00:00",      "status": "Balanced",      "currencyId": "NOK",      "balance": 800.0000,      "balanceInCurrency": 800.0000,      "cashDiscount": 0.0000,      "cashDiscountInCurrency": 0.0000,      "paymentMethod": {          "id": "1",          "description": "Innlandsbetalinger"      },      "supplierReference": "Tollvesenet innførsels mva (Alti",      "description": "",      "createdDateTime": "2020-08-20T18:20:19.263",      "lastModifiedDateTime": "2020-08-20T18:20:19.263",      "note": "",      "location": {          "countryId": "NO",          "id": "MAIN",          "name": "Primary Location"      },      "vatTotal": -200.0000,      "vatTotalInCurrency": -200.0000,      "branchNumber": {          "number": "1",          "name": "Compello AS #ISV"      },      "payDate": "2020-09-15T00:00:00",      "cashAccount": "1920",      "metadata": {          "totalCount": 1,          "maxPageSize": 500      }  }    This is the increate invoice on visma system with invalid  document type.               Could you help us?    Best Regards.  Margarita G ... 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Hello, we are using the API and need to convert a Sales Order into a  Purchase Order. I can make this action in web  front, but i don´t know if this action is allowed through API.  Could you please tell me witch  API method do i need to use?   Basically to do the next through API:   Thanks   Margarita     ... Visa mer