CRM WebUi - Saving possible, also when mandatory field is empty

Hi experts,

on creation/editing screen of incident, I've maintained a view fields as mandatory (e.g. description).

But when the descripition field is empty, saving is also possible?!?!

I get an error message in the header, that I've to fill out the empty fields, however saving is possible and it creates a new incident order.

How can I make a mandatory field to a real mandatory field?

Or how can I change the "saving-process" so, that it is only possible, when no mandatory fields are empty?

Thx in advance