title: Cannot commit change in SQL developer
body: <p>I changed data in table field and then I clicked on the "COMMIT" icon. The data was not updated and I saw this message from the Data Editor-log.</p>
  
  <pre><code>One error saving changes to table "EVO"."T_CAP_SUM":
  </code></pre>
  
  <p>However, when I used a query, the data has been updated.</p>
  
  <pre><code>UPDATE T_CAP_SUM SET FCNT_004 = '0' WHERE CELL_NO = 'MAT-02'
  </code></pre>
  
  <p>Why does this happen?</p>