I came across a peculiar case.
No of FET Days: 10
No of Fet hours per day: 2
No of rooms: 8 (out of 8, I marked 3 rooms unavailable all times). i.e only 5 are available all times
So, the timetable is possible only for 100 activities (10*2*5)
Just to check, I added 105 activities. Surprisingly FET is not saying "not enough room" and it is trying to find a timetable...
An example is attached. At the start of timetable generation itself, it should point out that there is not enough room for 5 (105-10*2*5) activities. The highest timetable contains 100 activities, at least then FET should pop-up an error saying no room for remaining 5 activities.
Unfortunately, it is a normal behavior. FET cannot take care of all the situations.