input: [Field] Enable External Transaction Controller (JTA) [Description] 
output: Check this field if you intend to integrate your application with an external transaction controller. For more information, see Unit of Work Transaction Demarcation. If you configure Platform for a Java EE application server that EclipseLink supports, the EclipseLink runtime will automatically select the appropriate external transaction controller class. If you configure Platform as Custom, you must specify an external transaction controller class by selecting an External Transaction Controller.