create a new „Coulour/Size-combination“ with the description „voucher“ and add the two items „voucher... her cash-in“.
This further setting can easily be defined (under „Coulour/Size-combination“ – New) and... up:
Fill-in the fields based on your own needs. Depending on the layout of the voucher you have lodg... ut or open it again into the account as a credit, depending on how you need it), or redeem it for an i