Clients can delete pending orders from the view order screen

Clients can delete completed orders from the view order screen

Clients can delete POS orders that are NOT on a bill - This is done from the POS View orders screen

In summary if the order can get to the View Order screen or is viewable on the Point Of Sale >> View Orders screen it can be deleted. However there are some kinds of orders that do not make it to these screen here is a listing of them and under what conditions. (In essence the order has to get to the view order screen to be delete-able)

Clients cannot delete these kinds of orders - This is specific to 'on account' orders.

Guest pass orders (on account) in any state (on a bill or not) cannot be deleted by the client.
Order (761) not on a bill and (760) in a bill
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Point of Sale orders that are ON a bill cannot be deleted. (759)

Guest Pass orders on a bill Cannot be deleted. (760)

Bills cannot be deleted.