So if a regular officer has done less than the prerequisite time as an SO2 to be boarded for an SO1 post, iaw the AP, he would not be considered for promotion. However, if an FTRS officer who left as an SO3, rejoins as an SO2, and then after say 2-3 years with a 'Yes' for promotion, applies for an SO1 FTRS post and is successful (because there is no one else applying) that is acceptable?