Under Uniform Guidance, the federal government developed language specific to travel on sponsored projects. It is summarized for UofL as follows:
This Guidance specifies that documentation must justify that an individual’s travel had a direct benefit to the project. For travel costs charged directly to a Federal award, the individual/traveler will need to submit additional documentation with their travel expense voucher which demonstrates that the travel was necessary and had a direct benefit to the Federal award. Examples of such documentation may include letters of invitation to meetings, copies of posters, abstracts or other presentations. If this documentation is not provided with the travel expense voucher, the travel may be found unallowable and the expense will have to be moved to an unrestricted source.