How to Decrease the Bill Rate for a Customer before Clicking Create Invoices

Invoicing - 
In the professional house cleaning business, accidents in the field will happen. And when they do, a customer might deserve to be issued a credit.

In this example the technician broke a lamp while cleaning a job. Before clicking the Create Invoices button there's an easy way to modify the bill rate to allow for a credit to be added to a job that's been completed for the day.