I wonder why these errors keep showing up in version 11 ! 
example about (Compare user objects):
in v 10 of PLD:
----------------
-- Enable/Disable primary, unique and foreign key constraints
alter table AGR_DISSENTS
enable constraint AGR_DISSEN_AGE_FK;
in v 11 of PLD:
----------------
-- Validate/Unvalidate primary, unique and foreign key constraints
alter table AGR_DISSENTS
modify constraint AGR_DISSEN_AGE_FK validate;
WHICH IS WRONG !!!
in v 10 of PLD
--------------
-- Enable/Disable check constraints
alter table ARCHIVES
disable constraint ARCHIVE_TYPE_CHK;
in v 11 of PLD
---------------
-- Validate/Unvalidate check constraints
alter table ARCHIVES
modify constraint ARCHIVE_TYPE_CHK novalidate;
WHICH IS WRONG !!!
in v 10 of PLD
--------------
-- Enable/Disable primary, unique and foreign key constraints
alter table COURTS
disable constraint COURT_PK;
in v 11 of PLD
--------------
-- Validate/Unvalidate primary, unique and foreign key constraints
alter table COURTS
modify constraint COURT_PK novalidate;
WHICH IS WRONG !!!
Please correct these errors in (compare user objects) as soon as possible.
Thanks.

example about (Compare user objects):
in v 10 of PLD:
----------------
-- Enable/Disable primary, unique and foreign key constraints
alter table AGR_DISSENTS
enable constraint AGR_DISSEN_AGE_FK;
in v 11 of PLD:
----------------
-- Validate/Unvalidate primary, unique and foreign key constraints
alter table AGR_DISSENTS
modify constraint AGR_DISSEN_AGE_FK validate;
WHICH IS WRONG !!!
in v 10 of PLD
--------------
-- Enable/Disable check constraints
alter table ARCHIVES
disable constraint ARCHIVE_TYPE_CHK;
in v 11 of PLD
---------------
-- Validate/Unvalidate check constraints
alter table ARCHIVES
modify constraint ARCHIVE_TYPE_CHK novalidate;
WHICH IS WRONG !!!
in v 10 of PLD
--------------
-- Enable/Disable primary, unique and foreign key constraints
alter table COURTS
disable constraint COURT_PK;
in v 11 of PLD
--------------
-- Validate/Unvalidate primary, unique and foreign key constraints
alter table COURTS
modify constraint COURT_PK novalidate;
WHICH IS WRONG !!!
Please correct these errors in (compare user objects) as soon as possible.
Thanks.