You must apply APAR PQ36382 to the 390 Enablement feature of DB2 for OS/390 Version 5 and DB2 for OS/390 Version 6 to manage these subsystems using the DB2 UDB Control Center for Version 7. Without this fix, you cannot use the DB2 UDB Control Center for Version 7 to run utilities for those subsystems.
The APAR should be applied to the following FMIDs:
DB2 for OS/390 Version 5 390 Enablement: FMID JDB551D DB2 for OS/390 Version 6 390 Enablement: FMID JDB661D