I know it's an option because I've seen it before, but now that I need it I can't find it anywhere!
I'm referring to the option that controls whether Quickbooks or Method will assign RefNumber values to new forms (eg Invoices, POs) that are being synched from Method to QB.
By default QB numbers Invoices incrementally based on the last saved Invoice #, but I'm using special rules in Method to number my Invoice, and don't want those values to be overwritten by QB's autonumbering system when it comes time to synchronize.