We donīt insert the ETP points into the FMC, they are after all not part of the clearance and need not be there. If you want to monitor those points, you can either use RTE 2 (Honeywell) or insert them after the destination airport leaving a discontinuity. Then they will show on the screen but not affect any calculations.
But as Spooky 2 says some flight plan formats are a bother
