ID numbers usually consist of numbers only. However in some cases they may be prefixed with a letter or letters. ie "CAP", "T", "OS-", "OSO-" etc.
If this is the case with your site you may include these prefixes here, otherwise they will be regarded as invalid.
The program will still only display the numeric portion of the ID number, but at least the test will not be disqualified.
*Sunquest versions of Ol Monitor only.
CPL/HMS does not have this.