Entering Number in filed 'phoneNumber' creates Error 400

[yuri]

Did you try to save other type than "Buro"?

Please consider debugging the class Item referred, I don't have time for the forum.

[agri]

I didn't know that you have a custom regular expression. Such details needs to be provided initially.

There was no any change in v7.2.7.

Sorry, I didn't think of that, as you answered my post concerning a custom regex.
Thank you so far, I will investigate and see, what I can find ...

[agri]

I tried this and that, and things work now. I'm sorry, I cannot say precicely what has solved the problem ...
Again thank you for your help!