The change history record is the actual details of a specific field changed in a table. The change record itself contains the details of the table and the specific table field (column) that was changed and the details of the specific change.
Changes may be the result of a new record being entered into a table, in which case the 'NEW' field value is populated, there being no 'OLD' value existing prior to the change. An update of a record will result in both a before (OLD) and an after (NEW) value being present for a field. The 'OLD' value may of course be NULL (empty) in which situation the NEW value would definitely not be NULL, or alternatively the 'NEW' value may be NULL in which case the 'OLD' value would not be NULL. When a record is deleted from a table there is no ''NEW' value, but there may be an 'OLD' value.
If a value field is of a character type then the displayed information is a text box and scroll bars would be present to enable one to inspect the record entry.
The change history records can not be edited by the component. The text area boxes are 'read only' which means that any changes made on the screen would be completely ignored.