Alter table prepvou drop constraint SYS_C0047360;                               
Alter table prepvou drop constraint SYS_C0047361;                               
Alter table prepvou drop constraint SYS_C0047362;                               
Alter table prepvou drop constraint SYS_C0047363;                               
Alter table prepvou drop constraint SYS_C0047364;                               
Alter table prepvou drop constraint SYS_C0047365;