As such, exercise physiology professionals often have the responsibility of conditioning a person to a higher level of fitness and/or health while, at the same time, being aware of safety issues (risk of injury, illness, environmental exposure, etc.) associated with a single session of exercise.
A voucher is an internal document used in a company's accounts payable department in order to collect and organize the necessary documentation and approvals before paying a vendor invoice.
My guess is that an invoice is for completed supplies or services, while a voucher is for interim payments (progress payments, interim payments on cost contracts, etc.). The distincition will not make a difference in what I am working on, but I do want to use the proper term. TIA. 1  Back to top.