Foreign Key Error Message ORA - 01430

Question

I have a table name LSU_INTER_RESOURCES_T. I would like to add a foreign key constraint with the following command:
alter table lsu_inter_message_t
add constraint inter_message_id_fk
inter_request_id REFERENCES lsu_inter_requests_t(inter_request_id) ON DELETE CASCADE;
The system returned the error message:
ORA - 01430: column being added already exists.
if I drop the column inter_request_id I will lose data and when I create the constraint it places the column at the end of the table. Losing data is not an issue now because the table has no data but down the line I can see that this will be a real real hassle.
I would like to have the foreign key column defined in the sequence I chose when I designed the table layout. That is to say I want all of the key columns placed at the begining of the table row layout.
Can I move the column after I define it and how is this done? Is this a 10g feature?
Thank you, Ned

Answer 1

Try
alter table lsu_inter_message_t
add constraint inter_message_id_fk
foreign key(inter_request_id ) REFERENCES lsu_inter_requests_t(inter_request_id) ON DELETE CASCADE;