refers to the issuance of an appointment as a result of reorganization, devolution, salary standardization, re-nationalization, recategorization, rationalization or similar events, including the following: (1) The issuance of appointment from temporary to permanent, career to non-career or vice versa, non-career to another non-career, all of which entails no gap in the service, shall be considered as reappointment. Non-career employees who are appointed for the first time in the career service under permanent status shall be required to undergo probationary period for six (6) months. (2) The renewal of temporary, contractual and casual appointment upon the expiration of the appointment or subsequent appointment of substitute teachers, which entails no gap in the service, shall be considered as reappointment. A temporary appointment may be renewed in the absence of an applicant who meets all the qualification requirements of the position as certified by the appointing officer/authority and provided that the performance rating of the employee is at least Satisfactory. […] (CSC MC No. 14, s. 2018, ORAOHRA).