Problem enabling missed 540

Based on your description above, my best guess is that you have "Auto Enable Missed" On in the AUX User Options for the User you had active for that approach. This option automatically enables the missed approach at the FAF and is active user dependent. With Auto Enable Missed - On, you will not get an Enable Missed prompt inside the FAF at FMS FPL LSK 4 as the missed approach is automatically enabled; hence the barber pole past the MAP.

If correct, and you turn "Auto Enable Missed" Off for the active user, then you should get the Enable Missed prompt inside the FAF at FMS FPL LSK 4 as you were looking for in this thread.

The "Manual Sequence Req'd" occurs when the active FMS fix (on the missed in this case) requires a baro-corrected altitude input (think altimeter displayed altitude set for local altimeter setting) before it can automatically sequence to the next FMS fix. For instance, the initial missed approach instructions might state: "Climb to 3000' then turn direct XYZ and hold..."

Basically, if your airplane (like mine) does not have air data computer input to the IFD, the IFD does not know when that baro-corrected altitude condition is met and therefore cannot automatically sequence to the next FMS fix on the active flight plan (missed approach). IFD determined GPS altitude and encoder supplied pressure altitude are not correct for determining this altitude.

"Manual Sequence Req'd" means that the IFD is waiting for you to manually sequence to the next leg of the active FMS route (Activate Leg on FMS FPL page LSK 2 with appropriate FMS FPL fix selected) at the appropriate time since the IFD cannot automatically do so.

Just my guess.