JavaScript CloneRow stopped working in Apex 4.2

Question

we ran a javascript Clone Row on our Tabular Forms in Apex 4.0
after upgrading to 4.2 we get
ERROR:
Current version of data in database has changed since user initiated update process. current row version identifier = "719C601E3911F88E9AD268A7EF06331F" application row version identifier = "Z"
column attribute: HTML EXPRESSION:
<a href="#" onclick="javascript:cloneRow(this)"><img src="#IMAGE_PREFIX#FNDADD11.gif"></a>Page Header:
<script type="text/javascript">
function fn_delete(t)
  var l_tr=$x_UpTill(t,'TR');
  l_tr.parentNode.removeChild(l_tr);
function pad(n)
var s = '0000' + n;
return s.substr(s.length-4);
function updateFields(f)
  var fields = document.getElementsByName(f);
  var j;
  if (fields.length > 0)
    for (j = 0; j < fields.length; j++)
      fields[j].id = f + "_" + pad(j+1);
function cloneRow(y)
$(y).parent().parent().clone(true,false).insertAfter($(y).parent().parent());
        //CREATE NEW ROW
        newRow = $(y).parent().parent().next();
        //BLANK N_PK AND ANY OTHER HIDDEN FIELDS
        newRow.find('[name=f02]').val('');
        //DONT KNOW WHAT THIS DOES
        newRow.find('[name=fcs]').val('Z');
        //REMOVE CHECKBOX SINCE IT WONT WORK ON THE NEW ROW
        newRow.find('[type=checkbox]').remove();  
        //HIGHLIGHT NEW ROW
        html_RowHighlight($(newRow).get(0),"#9E0200");
        //CHANGE CLONE ICON TO A DELETE ICON
        newLink = $(newRow).find('img')[0];
        newLink.src = '#IMAGE_PREFIX#FNDERROR.gif';
        $(newLink).parent().removeAttr('onclick');
        $(newLink).parent().get(0).onclick = function()
        {fn_delete(this)};
        //Remove Datepicker
        if ($(newRow).find('img').length > 0)
              for (dt = 1; dt < $(newRow).find('img').length; dt++)
              remDate = $(newRow).find('img')[dt];
              remDate.width = '0';
              remDate.hieght = '0';
        //UPDATE NEW FIELD IDs
        $(newRow).find('INPUT').each(function(index)
        var x = '0' + index;
        x = x.substr(x.length-2);
        updateFields('f'+x);
</script>

Answer 1

I set up an example on apex.oracle.com
WORKSPACE: merlin128
User: testing
pass: testing
run the app
click green + sign
if you type a new EMPNO and click submit
the row disappears (its not inserted)
however..
if you click the green + sign
click submit
the null validation will do something to the row that allows it to now insert..
enter the EMPNO and click submit..
so what is the validation doing, how can I get the clonerow javascript to do that so it will insert the record..