Summarization Problem in R4981 - Freight Update

Client is running Transportation, and has about 100 shipments per day.  Each rated shipment usually has between 2 to 5 records in F4945 - Shipment Charges.  All freight charges are captured in a single G/L account for Freight Expense.  If we run Freight Update at night, with the Summarize switch ON, then we get a single debit to freight expense.  If we run it with Summarize Switch OFF, then we get 2 to 5 records for each shipment, multiplied by 100 shipments, so that's about 300 records per run.  The client would like to have 1 debit for each shipment.

In order to achieve the goal of having 1 F0911 record per shipment, we would like to run Freight Update as each shipment is shipped.  We noted that the R49645 processing option template states that you can call Freight Update for shipments with INBOUND freight ONLY.  So, we are wondering why the system will not allow you to run Freight Update from Ship Confirm for OUTBOUND freight.