How to add INLINEHTML field to sublist in Suitelet

Hi,

I'm having an issue with adding an inlinehtml field as sublist field.
On header level it is going without problems.

My Code (part of it) :

define(['N/ui/serverWidget', 'N/search', 'N/email', 'N/runtime', 'N/record', 'N/log','./moment.min'],
        function(ui, search, email, runtime, record, logger, moment) {
    function onRequest(context) {
        if (context.request.method === 'GET') {
            var form = ui.createForm({
                title: 'Suitelet page'
            });

            var company = form.addField({
                id: 'custpage_company',
                type: ui.FieldType.SELECT,
                label: 'Company',
                source: 'Subsidiary'
            });

    var editPage = form.addField({
                id: 'custpage_edit_html',
                type: ui.FieldType.INLINEHTML,
                label: 'INLINEHTML'
            })   

var sublist1 = form.addSublist({
                id: 'sublist',