Control-M: 22_NAQ_NONSAP - Event: JOB NOT OK App: LYNX-IS-BI-QA-FQ5 Job: RMAN-INCREMENTAL-BACKUP Folder: 9N2QA22_LYN-DATABASE-BW_SEC
incident came due to observer not started after Q4 os patching activity 
after starting observer backup completed successfully 
hence resolving this incident