Tabular form - adding new row

Hi,
I have a very simple table (5 rows, 1 of which is the primary key), and want to update the table using a tabular form. On initial display, the primary key column is protected (cannot be changed) which is ok for DELETE and UPDATE options, but when I come to ADD A NEW ROW, the new row has NULL defaulted as the primary key value, and will not let me update it !!
Does anyone know how I can leave the primary key column protected when UPDATING or DELETING, but allow a value to be entered when ADDING A NEW ROW ?
thanks
Tim

Andy,
Just made the following changes (to remove NARR1_CODE_DISPLAY and show and edit NARR1_CODE):
select
"NARR1_CODE",
--"NARR1_CODE" NARR1_CODE_DISPLAY,
"NARR1_LOWER_LIMIT",
"NARR1_UPPER_LIMIT",
"NARR1_RMP_MIDPOINT_1",
"NARR1_RMP_MIDPOINT_2"
from "#OWNER#"."DQ_PD_TRANS_DIST_BAND_NARR1"
where the column NARR1_CODE is my primary id, and in the report attributes, NARR1_CODE is now editable and shown as a "text field" . NARR1_CODE_DISPLAY has been removed.
However, when I go into my form screen, although the NARR1_CODE field is now editable, when I click ADD NEW ROW, enter the details for a new row, check the box alongside the new row and click SUBMIT, I get the following error message :
Error in mru internal routine: ORA-20001: Error in MRU: row= 1, ORA-20001: ORA-20001: Current version of data in database has changed since user initiated update process. current checksum = "A884FA378C851786DDFE3A33709CB23C", item checksum = "F6395FDACE39D98E784F85C19D960620"., update "GRD_DD10_OWNER"."DQ_PD_TRANS_DIST_BAND_NARR1" set "NARR1_CODE" = :b1, "NARR1_LOWER_LIMIT" = :b2, "NARR1_UPPER_LIMIT" = :b3, "NARR1_RMP_MIDPOINT_1" = :b4, "NARR1_RMP_MIDPOINT_2" = :b5
sorry about this !
thanks

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