A mandatory field must contain a value. Attempting to save a record without adding a value to a mandatory field generates a warning message and returns the user to the field to be completed.
The background of a mandatory field can be set to display in a different color. By default, mandatory fields are displayed with a yellow background:
Note: Fields are defined as mandatory with the Mandatory Registry entry. Any field in any module can be defined as mandatory and there may be many mandatory fields in any one module. In most cases, fields are defined as mandatory at the group default level and are the same for all users.