Dear Sirs,
I would like to make three activities of each of three subjects be simultaneous in three groups, but can be mixed between them. Which restriction would fit muchh better?
Thanks,
Xavi
you are 100% sure it must be 100% simultaneous? most guys are insistent that it must be simultaneous (because it was always so or they can't imagine there is an other solution), even it is not true.
if you are not 100% sure, please read chapter "years, groups and subgroups" from the manual. (don't forget one group might have the activity friday the last hour (period) while the other two groups already have free. but on monday in the last hour this two groups have their activities, while the other has free.)
http://www.timetabling.de/manual/FET-manual.en.html#id_12
if you are 100% sure that they must be 100% simultaneous. use fet -> data -> time constraints -> activities -> a set of activities have same starting time (day + hour).