@adriano100,
Unless you shoplifted while driving, it's not a traffic violation.
Unless Dutch law says otherwise, you've got to disclose it.
But check with a Dutch lawyer, because entering a plea down to a fine might not be considered being a 'suspect in a criminal offense', and the I assume small fine might also not qualify specifically as a criminal offense. Also find out if this is a reasonable question for an employer to ask or if any of your country's privacy or other laws prohibit it.