• A predefined list, which cannot be changed, is attached to the field in the Data Definition file. For more information, see Data Definition Files.

• The field is an Attachments field, which provides for specifying the external files that are to be copied into the Attachments folder so that they can be opened from Windchill Risk and Reliability. For more information, see Data Field Types.

• The field is a foreign key field, which means it is a key field not for the primary table but for a higher (parent) table. For example, if System Tree Identifier, a field from the System Tree Items table, is inserted in the FRACAS Incidents table, string replacements are not allowed.

• The field is a special field predefined internally for use in a particular way. You cannot customize or re-purpose special fields. They are generally available for insertion in particular support files, such as Audit Trail files, Report Design files, and Workflow files.

• The field is a calculated field that is predefined in a particular way. Calculated fields cannot be customized or re-purposed. They are present in the windows in which calculation results are viewed. You can insert calculated fields in Report Design files to output the calculated results for records to reports.