A voucher will only deduct the fee that is being charged by the issuing organisation. Due to this if the voucher amount is greater than the organisation's fee the whole voucher amount will not be utilised for the registration. 

Example. $200 Voucher being issued by the club 

When at the Payment stage of a registration you will be able to input a voucher code if it has been issued by a club. 

You must then insure that you are selecting the appropriate organisation who have issued the voucher. 

Due to the voucher being issued by the club ONLY their fee will be deducted.