Best way log BusinessOperation executions

[BusinessOperation(typeof(ChangeFreightContext))]
[DisplayName(@"Default implementation")]
[Description("Performs change of freight costs by a predetermined amount in%.")]
public class ChangeFreightContextDefaultImpl : OperationServiceBase
{
public override void Execute(IBusinessOperation businessOperation)
{
var bo = (ChangeFreightContext)businessOperation;
bo.Process.Name = bo.Name;var rate = (decimal)(bo.Percent / 100);if (bo.Orders == null || !bo.Orders.Any())
return;

using (var objectSpace = BusinessOperationManager.Instance.Application.CreateObjectSpace())
{
bo.Process.TotalStep = bo.Orders.Count;
var step = 0;
foreach (var rawOrder in bo.Orders)
{
var order = objectSpace.GetObject(rawOrder); // Order in the current ObjectSpace
if (order == null)
continue; // The Order is absent in the DB
var oldFreight = order.Freight;
order.Freight = order.Freight + (order.Freight * rate);
var msg = string.Format(Resources.Order, order.Number, oldFreight, order.Freight);
bo.Process.NextStep(msg, step);
bo.ProcessedOrdersLog.Add(msg);
step++;
}
objectSpace.CommitChanges();
}
}
}

bo.Process.NextStep(msg, step);