Just change format in DB.
B) Magic.

Thank you for your reply.
But even when I change in the DB, I get the following error message "field length exceeds 100 characters"

Thank you for your help.

You must also increase refName in table planningelement.

I tried but it seems that I do not understand, is which line of the file please?

is it here: "refName" => "hidden"?

Thank you for your help.

It's ok now,
I had to edit in the Planningelement table and not in the planningelement file.

Thank you very much

I also have the same problem but error when creating Scheduled reports!
Please help me!
Thanks!

Then update table cronautosendreport to extend reportParameter column