Originally Posted by tennisguru

The OE block is exactly your issue. Your schedule is locked until IOE is complete and the “OK” is placed on your schedule.

The 2200 PCS run 3 full days prior is your last chance to alter a day. So if you are trying to move an X day onto or from a Friday, 2200 Monday is your last shot. You can drop a reserve day via PD, IVD, APD, etc up till 0700 the day prior assuming you don’t already have an assignment by that point.