Hi, object I am working with is SupplierInvoice. If I have a connection to purchase orders, I take value on the invoice header "ddPurchaseOrder" like AddPurchaseOrder { poOrderNumber = new PoOrderNumber { value = i.PurchaseOrderNo } and on the invoice row "linkLine" new LinkLine() { purchaseNumber = new PurchaseNumber { value = item.PurchaseOrderNo }, purchaseLineNbr = new PurchaseLineNbr { value = int.Parse(item.PurchaseOrderLineNo) } }; endpoint https://integration.visma.net/API/controller/api/v1/supplierInvoice RestRequest(Method.POST);
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