I have some views in my Informix DB - connected via JDBC - that contain a 
primary key and are updateable with informix tools. But when I access those 
views via OO I can not update them.

Example of my Informix DB
 19 create database direct in dbspace06 with buffered log;
 20
 21 --BD Rechte
 22 grant dba to "informix";
 23 grant dba to "public";
 24
 25 create table yucatan.inetplzzo (
 26     inpz_id integer not null ,
 27     inpz_lake_id char(12) not null ,
 28     inpz_plz_inte_von char(10) not null ,
 29     inpz_plz_inte_bis char(10) not null ,
 30     inpz_kund_id integer,
 31     inpz_aumi_id char(12),
 32     primary key(inpz_id)
 33 );
 34 revoke all on inetplzzo from public;
 35 grant select on "yucatan".inetplzzo to "public" as "yucatan";
 36 grant update on "yucatan".inetplzzo to "public" as "yucatan";
 37 grant insert on "yucatan".inetplzzo to "public" as "yucatan";
 38 grant delete on "yucatan".inetplzzo to "public" as "yucatan";
 39 grant index on "yucatan".inetplzzo to "public" as "yucatan";
 40
 41 insert into inetplzzo values (0,"D", "0000", "9999", 1, "1");
 42
 43 create view ip (
 44     inpz_id,
 45     inpz_lake_id,
 46     inpz_plz_inte_von,
 47     inpz_plz_inte_bis,
 48     inpz_kund_id,
 49     inpz_aumi_id
 50 ) as
 51 select
 52     inpz_id,
 53     inpz_lake_id,
 54     inpz_plz_inte_von,
 55     inpz_plz_inte_bis,
 56     inpz_kund_id,
 57     inpz_aumi_id
 58 from inetplzzo;
 59 grant select,insert,update,delete on ip to dpauli,bdonauba,mstockin;
 60
 61 insert into inetplzzo values (1,"D", "0000", "9999", 1, "1");