Answer:
The cancellation of vouchers by treasurer personnel
Step-by-step explanation:
When a business uses vendors for some of its service needs there is the possibility of paying vendors twice for the same service of invoice is submitted twice.
The treasurer is the person that disbursed funds to vendors for services rendered. He is tasked with cross checking if payments are duplicated.
To avoid this it is best to have the treasurer personnel cancel vouchers that have been paid.
This will provide an effective check on duplicate payments.