private void AddLine(PurchaseOrder purchaseOrderDocument, PurchaseOrderItem line)
        {
            var _             = purchaseOrderDocument.AddLine();
            var itemReference = GetItemEntityReference(line.ItemCode);

            if (itemReference == null)
            {
                Logger.Debug("{@Item} was not found in Sage. Please create it manually for to be imported", line.ItemCode);
                return;
            }
            var stockItem = Company.Factories.StockItemFactory.Load(itemReference as EntityReference <StockItem>);

            _.AccountReference       = stockItem.COGSAccountReference;
            _.Quantity               = line.Qty;
            _.UnitPrice              = line.Rate;
            _.Amount                 = line.Amount;
            _.Description            = line.Description;
            _.InventoryItemReference = itemReference;
        }