When an employee uses sick leave or vacation, or both, because of an injury compensable under the Labor Code, and the California State University is reimbursed by a third person for its damages by reason of this use, there shall be granted, for credit to the employee’s sick leave or vacation account, sick leave or vacation equivalent to the amount so used or proportionately if reimbursement is only in part. If the California State University does not collect from the third person the full amount of the compensation paid and other damages for which it is liable to the employee, and if the amount collected is not itemized so that there may be ascertained the amount collected in reimbursement for the sick leave or vacation used, the sick leave or vacation to be credited shall be in the same ratio to the sick leave or vacation used as the total amount collected bears to the total amount of the California State University’s damages. “Sick leave” or “vacation,” as used in this rule, includes sick leave or vacation credit used to augment disability indemnity.