Enabled Primary Key not reinforced in 7.2

Hi, 

I have created a table like this : 

CREATE TABLE public.DIM_PAYS_TEST (
      CODE varchar(3) NOT NULL,
      CODE_NUM int NOT NULL,
      ALPHA2 varchar(2) NOT NULL,
      ALPHA3 varchar(3) NOT NULL,
      LIBELLE_FR varchar(100) NOT NULL,
      LIBELLE_EN varchar(100) NOT NULL,

      CONSTRAINT PK_DIM_PAYS_TEST PRIMARY KEY (CODE_NUM) ENABLED  

)
UNSEGMENTED ALL NODES 
KSAFE 1 ;

And loaded some data.

When I try to load the same data again using an ETL tool like SAP BusinessObject Data Services (ODBC) or Talend (JDBC), the data are loaded and therefore duplicated even if the constraint is enabled. But if I try a simple 

INSERT INTO public.DIM_PAYS_TEST (CODE,CODE_NUM,ALPHA2,ALPHA3,LIBELLE_FR,LIBELLE_EN) VALUES ('894','894'::Integer,'ZM','ZMB','Zambie','Zambia') ;

using another JDBC compliant client (like DbVisualizer) then I get a PK violation error.

How come the PK is not reinforced with the ETL tools, is there a connection parameter to add in the client configuration ?