The purpose of this part is to establish Governmentwide policy and guidance for acceptance by a Federal agency of payment for travel expenses from a non-Federal source for employees to attend meetings. It describes how such payments must be accepted by the agency for travel of agency employee(s) and/or the employee's spouse for official Government travel. Except as provided in § 304-3.13 of this part, advance agency approval is required to receive such payments.
41 C.F.R. §304-3.2