Garmin GPS 400 Pilot's Manual And Reference page 105

To modify a user waypoint by changing reference waypoint information:
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If you attempt to modify or delete a waypoint which is currently a
direct-to waypoint or the current "from" or "to" waypoint in the active
flight plan, the GPS 400 will alert you with the "Can't change an
active waypoint" or "Waypoint is active and can't be deleted" message.
You must first cancel the direct-to or remove the waypoint(s) from the
active flight plan before modifying or deleting the waypoint(s).
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WPT PAGES
Creating / Modifying
User Waypoints
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