Impossible to leave "manual" planning mode as some "real" planning exists

Hi,

I thing you make a confusion beetween "Manual Planning mode", and "Fixed duration mode" that give acces to manual input of progress.
"Manual planning mode" give possibility to enter planned dates through "Planned intervention screen". You cannot change the mode if some planned intervention exist.
For "fix duration mode", if you select the option in global parameter, you can manually enter progress on the activity (as long as there is no assignment on the activity)