In FUJITSU Enterprise Postgres 14 will change restricted triggers to not be supported by replace operations (OR REPLACE).

FUJITSU Enterprise Postgres 13 SP1 or earlier

You can replace a constraint trigger.

[Example]

=# CREATE OR REPLACE CONSTRAINT TRIGGER my_constraint_trigger AFTER DELETE ON my_table
-# FOR EACH ROW
-# EXECUTE PROCEDURE funcA();
CREATE TRIGGER

FUJITSU Enterprise Postgres 14 or later

It does not support replacing a constraint trigger.

[Example]

=# CREATE OR REPLACE CONSTRAINT TRIGGER my_constraint_trigger AFTER DELETE ON my_table
-# FOR EACH ROW
-# EXECUTE PROCEDURE funcA();
ERROR:  CREATE OR REPLACE CONSTRAINT TRIGGER is not supported

None.