A320 Fcom 4 Q.
Ref:FCOM 4.05.60 P10
I just don't understand the following:
"Manual Termination:
You should not use DES mode when entering a leg with manual termination.Manual termination,which is definded as a track or a heading with no termination,is always part of a database procedure.
The computed descent flight profile may not be adequate when flying this type of leg.