Sure. If you don't want to track sales invoices in OkiOki (and therefore also not their payment status), you can specify this in the 'Settings' as follows. OkiOki will now
- ignore your sales transactions and therefore not put them on your to-do list.
- ignore your sales invoices and therefore not put them on your to-do list.
This will not stop OkiOki from picking up your sales invoices, should she find them in your linked mailbox, but they will never show up on your task list.