Read the form as it shows other cases where the W8BEN is used and not used.
Part 1 of the form asks for Identification of Beneficial Owner.
Part 2 Claim of Tax Treaty Benefits (if applicable).
Part 3 Notional Principal Contracts.
Part 4 Certification - then sign and date the form.
Request form W8BEN from any foreign person or organization to which you are making a payment if it is the beneficial owner of the income, wether or not it is claiming a reduced rate of, or exemption from withholding.
For more information see the right column of page 2 of the W8 Instructions.