Read only column in tabular form

There is a not null column ( say SEQ) in a tabular form that is getting an auto value from other process. 2 more columns need user input on each row.I need to make this column(SEQ) as read only.
If I make this column (SEQ) as standard report column then when I submit the newly added row , I always get ORA-20001 error- can not insert NULL into SEQ.. even though I can see there is a value there. Switch ithe column back to text field, the insert went just fine .
How do you solve this read only column issue ?
Thanks a bunch for your help.
Tai

thank you for your reply.
Nope, SEQ is not the first column. Primary Key is and I leave the pK alone.
When I press ADDROW button , tabular form is like the following: ( table alreay has 2 rows), I auto populate SEQ column and I like to make this SEQ column display only.
-- represents checkbox
PK      SEQ      col1           col2
--     1     890          test1
--     2     675          test2
--     3

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