Form does not update table correctly

Hi experts,

Here is the situation:

I've written a function whose purpose is to check a record and set a boolean to TRUE/FALSE accordingly.
I call it in the the sourceExpr property on the dedicated form.
If the process reaches the end of the function then the boolean is set to true.

It works fine on form level, every line of the record which reached the end of the function is marked with true.

But when going into the table it is not updated and every record is set to false. I've to click every line (on the form) to update them and then
it's okay. So it seems that I need to refresh every line at form level in order to have them written in the database.

I tried several things but it didn't work so have you any idea why it is not working?

Many thanks,