SYS.XOQ_VALIDATE dependencies on REGISTRY$ERROR

Line 31: SELECT 0 INTO dummy_num from sys.registry$error

27:
28: IF ok THEN
29: --check for errors during installation/upgrade
30: BEGIN
31: SELECT 0 INTO dummy_num from sys.registry$error
32: WHERE identifier='XOQ'AND rownum <=1;
33: -- at least one install error was found so component is invalid
34: ok := FALSE;
35: EXCEPTION