[SQL] Pb with insert statement

[Patrice OLIVER]

To try to solve my precedent problem (PB with stored procedure), I made 
this :

 Table "structure.categtype"
Column  |   Type   | Modifiers
---------+----------+-----------
catcode | varchar(5)  | not null
catlib  | varchar(35) |
Indexes:
   "pk_categtype" primary key, btree (catcode)
   Table "structure.types"
Column  |   Type   | Modifiers
---------+----------+-----------
typcode | varchar(5)  | not null
catcode | varchar(5)  | not null
typlib  | varchar(50) |
Indexes:
   "pk_type" primary key, btree (typcode, catcode)
   "type_categorie_fk" btree (catcode)
Foreign-key constraints:
   "fk_type_classe_categtyp" FOREIGN KEY (catcode) REFERENCES 
structure.categtype(catcode) ON UPDATE RESTRICT ON DELETE RESTRICT

                      Table "structure.uv"
 Column  |         Type         |           Modifiers
----------+----------------------+--------------------------------
uvnum    | varchar(5)          | not null
typcode  | varchar(5           | not null
catcode  | varchar(5)          | not null default 'UV'::codeart
uvnumnat | numeric(5,0)         |
uvnom    | varchar(50)         |
uvcycle  | character varying(2) |
uvvaleur | numeric(5,2)           |
Indexes:
   "pk_uv" primary key, btree (uvnum)
Foreign-key constraints:
   "fk_uv_caracteri_type" FOREIGN KEY (typcode, catcode) REFERENCES 
structure.t
ypes(typcode, catcode) ON UPDATE RESTRICT ON DELETE RESTRICT

When I try to insert values in structure.uv like this :
INSERT INTO structure.uv VALUES ('SGBD','DUVC','UV',0,'BASE DE 
DONNEES','B2',.5);

I get the following message :
ERROR:  insert or update on table "uv" violates foreign key constraint 
"fk_uv_caracteri_type"
DETAIL:  Key (typcode,catcode)=(DUVC,UV) is not present in table "types".

Here the related values of structure.types table :
typcode | catcode |                             typlib
---------+---------+----------------------------------------------------------------
UVC     | UV      | UV+de+cours
DUVC    | UV      | Demi-UV+de+cours
UVTP    | UV      | UV+de+TP
DUVTP   | UV      | Demi-UV+de+TP
UVTC    | UV      | UV+de+TP-Cours
DUVTC   | UV      | Demi-UV+de+TP-Cours
Anyone has an idea ?
Regards,
Patrice
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TIP 9: the planner will ignore your desire to choose an index scan if your
      joining column's datatypes do not match