When an employee is entitled to grade and/or pay retention, the employing agency shall give to the employee, with a copy of the Notification of Personnel Action (SF-50) documenting entitlement to grade and/or pay retention, a letter describing the circumstances warranting grade and/or pay retention, and the nature of that entitlement. [45 FR 85656, Dec. 30, 1980. Redesignated at 70 FR 31310, May 31, 2005]