[SOLVED] Problem saving user from backend

I am having a weird problem saving a user from within the backend.
I am getting the error message that some fields like birthdays must meet a minimum of 25 characters. Of course this message does not make sense for the birthday field.
There are other fields for which I am getting the same error message. One of them is a drop down selection field. Also for this field it does not make sense to get a minimum character warning.

It seems that this is hardcoded somewhere. But where ?

Edit: And yes I am fully aware that I can turn off field validation in backend.

That's based off the fieldMinLength parameter, but it doesn't exist for those 2 fields. Did you change a fields type in your database perhaps? As this can cause this issue. Re-saving the field should clear invalid parameters though.

krileon wrote: Did you change a fields type in your database perhaps? As this can cause this issue. Re-saving the field should clear invalid parameters though.

Yes in fact I have changed a multicheckbox field into a querymulticheckbox field. As it seemed to be unrelated to the birthday (date) field I never thought this could be the reason.
Re-saving did in fact clear out the error message.