>I have found the solution for this thread. I used two variables with the next conditions and code:
>
> Variable Name : TotalShipments
> Val to Store :iif(tmpShipment=Invoice.Shipment,TotalShipments,TotalShipments+1)
> Init value : 0
> Reset at: End of Report
> Calculate: Nothing
>
> Variable Name : tmpShipment
> Value to Store :Invoice.Shipment
> Init value : 0
> Reset at: Invoice.Shipments
> Calculate: Nothing

Very good. Believe or not I was just working on a solution to this using two report variables also. Sorry I could not help. Give yourself the points :)