I've got a not nullable field in OData V2:
<Property Name="Regnum" Type="Edm.String" Nullable="false" MaxLength="35" sap:unicode="false" sap:label="EMD reg. nr."/>
The Object page marks the input as required; however, it is not validated, and POST is sent without field's value to the back end.

What could be a reason for such behavior?
Thank you.