I must say that I was completely wrong in my post RMAN connection to Catalog. In fact when connection to Catalog fails, RMAN quits and rest of script is ignored. So I've changed this. RMAN connect only to Target Database during backup process, and after that RMAN is run second time. This time it connects to Target Database and Catalog Database, then run command RESYNC CATALOG to force synchronization of control file with Catalog. It should work now.