Trouble updating a view through Forms

I have an updatable view which ties several tables together.  I only want to update one column in the view.  In SQL*PLUS I can issue an update on the view changing my column's value and using another column, which is a unique ID in the table my changed column is a part of, in the WHERE clause.

update rep_view rv
set rv.REP_ID = '10200'
where rv.REP_USE_ID = 14744                --this update works correctly

I created a form with a single data block against the view.  I want the user to be able to change the value of REP_ID and save it.