A new parameter at voucher that define if the voucher is allowed to keep the remaining amount of the voucher to use it later.
With this new parameter, when contact pays for their order which the amount less than the voucher amount, the remaining amount of the voucher is kept and could be used for next orders (instead of sending to Credit note or debtor profit).
Scope:
- Ticket shop: works now.
- Box office: will be delivered later.
