Deleting scheduled document instance

Question

Hi! I need to schedule an instance of Webi document and delete it in case if shcedule time is greater than predefined value or instance failed. Now the main problem is how to get last instance ID
I'm trying to  do the following
String sql = "select * from CI_INFOOBJECTS where SI_KIND='"
               + CeKind.WEBI + "' and SI_ID="; + InfoObject().getID(); 
IInfoStore.schedule(  InfoStore.getUnderlying().query(sql)   );
String newInstanceRef = infoObject.properties().getProperty("SI_NEW_JOB_ID").getValue().toString();
last string cause NullPointerEx because there are no such property.. may be I'm going the wrong way and It is possible to schedule document and get new instance ID with any other way?
Thanks
Oleg

Answer 1

Thanks! Casting to IWebi solved my problem with getting the latest instance, then analyze its status.
        // obj - is document IInfoObject
        // last instance
        IWebi webidoc = (IWebi)obj;
        int oldLastInstanceId = webidoc.getLatestInstance().getID();
        // scheduling a new instance
        InfoStore.getUnderlying().schedule(InfoObjects);
        // latest instance
        int lastInstanceId = webidoc.getLatestInstance().getID();