I have create new table in schema XYZ and load some data into table.

I have created one form in FORMS 6i in XYZ schma's new table.

Now when I am trying to update the column value from FORM after query it does not allow and display following error.

ORACLE error: unable to reserve record for update or delete.

I have check the table is not locked, table beloing to same schma where i have generated FORM so no issue of prvilege.