Work-related injury: In case of accidental injury, the work unit will generally issue an injury certificate, indicating the time, place and course of the injury. Traffic accident: if it is necessary to compensate for the lost time, the injured work unit should issue your proof of lost time, specifically indicating that employee XXX was injured in a traffic accident and was unable to go to work for XX days, deducting his salary during the lost time, and may also attach an income certificate.