Error while calling Computation process

Question

Hello Every Body
I have a form for inserting informations .
after the click on my submit button I redirect to another page on this page I have a textbox item called "P2_CODE_USER"
In my first page i added a computation process that set in P2_CODE_USER the ID of the current Insert process
But i have A msg error on My Sequecn Object "MY_TABLE_NAME"."SEQUENCE_NAME"

Answer 1

OK Honestly I dont remeber exaclly the msg error But I'll describe you what I did
First i want you to know that my english is to bad :-)
So
first I add a page process that insert into my table "MYTAB" a ligne ..
The structure of this table is
MYTAB1(CODE1 NUMBER(10),FIELD1 VARCHAR2(100),......)
well i have another Table MYTAB2 that has this struct
MYTAB2(
CODE2 NUMBER(10),CODE1 NUMBER(10),
CONSTRAINT CONST_FK FOREIGN KEY (CODE1)
REFERENCES MYTAB1(CODE1));
Ok ?
well After the calling of the process of insert ont MYTAB1 I need to get The value of CODE1 finaly added for that I added a computation that reference an Item X by the value of this CODE1 so I write on source attribute
SELECT MYTAB1_SEQUENCE.currval
and here i have the error
:-) thankyou for your help