A field is a location in a record in which a particular type of data is stored. For example, a contact record might contain the following fields: last name, first name, address, and phone number. A field is characterized by its maximum length and the type of data (for example, numeric or alphabetic) it can contain.
In the Siebel application, required fields have a star icon next to the field name. You cannot save a record until you enter data in the required fields.
If a field has a gray background, then the field is read-only, and you cannot change the field content.