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Hello, Anthony!

The board for this post is correct.

1) Please open the fet file with an XML editor or text editor. Search for <Time_Constraints_List> and </Time_Constraints_List>. Between these two are the time constraints, such as: <ConstraintTeacherNotAvailableTimes> ... </ConstraintTeacherNotAvailableTimes>. Please see an example of how this constraint is written in XML. Just add new constraints in this section, anywhere, but not inside an existing constraint.

2) Min days between activities constraints accumulate weight (the weight is stronger on two or more constraints for the same activities). You need to enable level 1, XOR level 2, XOR level 3, not two or more simultaneously. The reason for accumulation is that FET checks each constraint in turn.

You can activate/deactivate all constraints of a level with an advanced filter for comments, select all of them, and click activate/deactivate.

Activities preferred times constraints: for each activity, each cell of a table n_days x n_hours takes the maximum of each constraint as the final weight of not allowed, and FET only checks once the constraint for each activity.

You're welcome! 

Good afternoon, Maria, and welcome to the forum!

You need to use constraints of type teacher(s)/students (set) activity tag max hours daily/continuously (after you tag the activities as needed).

Feel free to share your fet data file, and I'll add the constraints as needed.

On Thursday, 9 July 2026, FET-7.9.1 was released. From the ChangeLog:

  - Bug fixes when saving/restoring the settings to/from an ini file (discovered with the help of Andrea Primiani). The bugs appeared when saving the settings to an ini file, in which case the settings were not the current ones, but the ones from the previous FET session, and when restoring the settings from an ini file, in which case the user could have met useless warnings for some options, like checking for updates on startup or enabling the option 'group activities in the initial order'; also, in these situations, when restoring the settings from an ini file and meeting these warnings, the settings might have been retrieved/set incorrectly if the user clicked 'No' or 'Cancel' in the respective message boxes.
  - Corrected a compilation warning, for a variable set but not used (reported by Andrea Primiani).
  - Minor interface improvements.
  - Updated the Russian translation, by Alexey Chernous.

We solved the problem with the help of Google Remote Desktop ( https://remotedesktop.google.com/home ). Thanking Google for this freely usable tool!

It was not a FET bug.

I answered. Note that I prefer email instead of forum PMs (easier to manage).

Your trick with Stebe Gasper seems interesting and useful. Another maybe better practical trick, because FET is not so constrained: add all his activities without a teacher, and constrain them to be max 2 simultaneous in all slots. Use activity tags to explain the teacher. You don't need to choose which activity is in first or second week.

About import: select field separator ";", and no text quote. Then select correctly the fields in the next dialog.

I have free time. If you need, we could make a remote desktop with Google and I'll check your problems on your computer.

Hello, Mojca,

I imported your students, then the activities import complained about 2 missing students sets. So I added them in the CSV file, imported again the students, then successfully imported the activities. I attach the normal warnings I got and the final fet file.

I work with GNU/Linux, but should be the same on any platform.

Please let me know!

PS: I just saw that teacher Stebe Gasper appears twice (second time with two spaces in the middle).

After I received Daniel's file privately by email, it turned out it was his error: each constraint had two tags selected, and all but one constraints allowed maximum 1 tag, but one constraint allowed maximum 2 tags (should have been also 1).

You are welcome!

Yes, good timing! 

Hmm... I hope it is not a FET bug. The constraint only admits 100% weight and should not be broken. Please send me your file as soon as possible - either you (I hope  ) or me made a mistake, and I want to investigate!

You can attach your file here, if it is public (you can archive if it is too large), or by email to fet4 AT lalescu DOT ro.

Please also send if possible a locked file and point me the program's error!

The constraint marked with X by me is activities preferred times for Students=3º ESO A
Subject=Tutoría. It is a constraint which does not affect any activity, and thus must be modified as instructed.

Payment received, I listed it, thanks!

Hello, and welcome to the forum!

Is it like this recent post: https://lalescu.ro/liviu/fet/forum/index.php?topic=6853.0 ? The new constraint introduced in FET-7.9.0 does exactly this; you might need to add more constraints of this type, for each full/half day. I am talking about the new constraint type activities max activity tags from set in selected time slots.

Or just the old constraint activities not overlapping?

Please let me know!

I am relieved to say that it is not a bug, but a feature: that constraint is useless, and you need to modify/deactivate/remove it. I attach the deactivated version.

You are welcome! 

PS: I kindly reiterate the need for financial support for FET.

It won't be lost, I will repair it personally, if it is a FET bug and because of the FET code. Please archive with zip or 7-zip or another packer and post it here! Please make backups of all your versions of this fet file on your disk, and FET history files if you used this feature!

We need to find the cause, so that other users won't have this problem. So tell me if you have a suspicion where FET might have been wrong.

Hello,

You can archive and post here. I think you cannot have an archive larger than 500 kb.

Did you create the file with the FET interface (so it is a FET bug), or with another FET XML-generating file program?

Hello! The final FET-7.9.0 version with the new constraint is just released. Thank you!