[guillotmarc]

Entonces pruébalo así.

Código SQL [-]
UPDATE CU0001 SET 
       LLICENCIA = (SELECT C10 FROM CU0001E WHERE C11 = CU0001.DNI), 
       NOM =       (SELECT C5  FROM CU0001E WHERE C11 = CU0001.DNI), 
       COGNOM1 =   (SELECT C6  FROM CU0001E WHERE C11 = CU0001.DNI), 
       COGNOM2 =   (SELECT C7  FROM CU0001E WHERE C11 = CU0001.DNI),
       CODIUCI =   (SELECT C13 FROM CU0001E WHERE C11 = CU0001.DNI)
WHERE EXISTS (SELECT * FROM CU0001E WHERE C11 = CU0001.DNI)

Salut.