Defining Required rules
The Required rule type makes a field required depending on the value or values of one or more controller fields in a view.
About this task
The field is validated to make sure that it has a value any time a change is made to the field or one of its controller fields. If the field is required but is missing a value, a message is displayed on the field and the Save button is disabled.
This rule can be defined on any field type, except on relationship fields where the object type (objectTypeName in JSON) is set to SOXDocument.
If a required field dependency is already defined on a field, you cannot define additional rules of this type on that field in a Task or Creation View.
The controllers must be either enumeration or actor fields.
On the JSON tab, a required rule is defined when type is set to required. You must specify either a controllers or controllerName attribute. See Defining Editable and Read Only rules for more details.
In the following steps, select Required in Rule Type.