How to disable the sub list in Payment record

/**
 * @NApiVersion 2.x
 * @NScriptType UserEventScript
 * @NModuleScope SameAccount
 */
define(['N/ui/serverWidget'], function(serverWidget) {
  
  function beforeLoad(context) {
    var form = context.form;
    var sublist = form.getSublist({
      id: 'apply'
    });
    log.debug(sublist);
    var fld= sublist.getField({
      id:'apply'
    });
    fld.updateDisplayType({
      displayType:serverWidget.FieldDisplayType.DISABLED
    });
      
      
    log.debug(fld);
    
    
  }
  
  return {
    beforeLoad: beforeLoad
  };
});