You can use the ? icon, not a jobnet icon, to display an unregistered custom job.

Specify from:

A JP1/AJS3 - View file

For details, see 11.1.1 Individual-user customization.

Specification

Use the following format:

jajsUnknownCustomJobJobnetIcon={Yes|No} (return)

To use the ? icon, specify No. To display the jobnet icon, specify Yes.

The default is Yes. If you omit this setting, Yes is assumed.

Example

To display a question mark (?) as the icon for unregistered custom jobs:

jajsUnknownCustomJobJobnetIcon=No (return)