how to export message in SAP gateway method CURD?

  I tried all what SCN described about this issue,but it didn't work, ,my version is NW 7.4 SP13, I'm not sure if any of you is using it, I really need to export message to front end with UI5, the problem is that i need to export message in method  entityname_get_entity & *_update_entity and so on,  and in this kind of method ,we have no related  field for message in this entity to export,please tell to how to export message in the method I said at above....thank you.