Rebooking is a means to adapt the original way payment was booked for an outbound lead. Quite often this used to either change the amount of claim credit used and or prepayment is used.
You access rebooking by going to the Account screen and then selection transactions. From the top of your screen, you then select rebook.
The rebook button is only available when a rebooking is possible.
You can rebook either all outbound leads which aren't invoiced or do it for a specific invoice period.