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NetSuite Professionals

Forget it, I found a way: record.submitFields.promise({
                    type: record.Type.INVOICE,
                    id: id,
                    values: {
                        'custbody_bri_correction_letter_timesta': date
                    },
                    options: {
                        ignoreMandatoryFields: true,
                        disableTriggers: true
                    }
                }