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my guess is that you have reserved characters in your field

follow the directions for <https://freemarker.apache.org/docs/dgui_quickstart_template.html#dgui_quickstart_template_autoescaping|Escaping for HTML, XML and other markup> in your template

or directly escape your field value using <https://system.netsuite.com/app/help/helpcenter.nl?fid=section_4392331185.html|xml.escape>