Specifies the value or denotes the field name. If Source Field IDis "0", this field is editable for constant values or Text variables. If Source Field IDis not "0", the program retrieves the field name and this field is not editable.
Specifies a key index. Keys are used for better performance during filtering. The program can only use one key for a table. This means that the Key Index does not need to be specified for all lines. The Key Index can only be set on the first line.
Note:
The key should comprise all filtered fields if it is possible, or comprise as many of the field used in the filter as possible.