Disallowing Empty Fields
The No Clear Field n user property disallows setting a field value to an empty value. It must specify the name of a business component field, not enclosed in quotes.
Use the No Clear Field n user property to stop a field from being cleared after it has been populated.
Once the field already has a value, you can change it to another non-empty value, but you cannot save it as blank, if you do the application displays the standard “field is required” message.
This is different from making a field Required, which enforces a value every time the record is saved; No Clear Field n only applies when someone tries to remove an existing value.
You can specify this user property with or without the numeric suffix. For more information, see Numbering Instances of a User Property.