Field Validation Before Update
In a USoft application window, when the user changes a field value in a record, first the record is locked. If the record itself contains subtype data, also the subtype record is locked.
When the user has changed a field value and leaves the field:
If a domain has a superdomain, the constraints on the superdomain are evaluated first, then the constraints on the domain itself. Within the domain, all checks are performed according to the Position in Checking Order attribute, set when defining the domain constraint.