IF we created Dynamic Field through Existing field it's does not appear to old nodes .

I had to write a patch to solve this problem. I wrote a new function at the end of the module:

function phptext_update_existing_nodes($type, $field) {
$i=0;
$sql = "SELECT nid FROM node WHERE type='".$type."'";
  $result = mysql_query ($sql);
  if ($result) {
    if (mysql_num_rows($result)) {
      while ($row = mysql_fetch_row($result)) {
        $node=node_load($row[0]);
        $mod=$node->changed;
        $node->$field = array(array('value' => ''));
        node_save($node);
		db_query('UPDATE node SET changed=%d WHERE nid=%d', $mod, $row[0]);
	    $i++;	
     }
   }
  }
drupal_set_message(t('%nodes updated.', array(
'%nodes' => format_plural($i, '1 node has been', '@count nodes have been'))));
return;
}

...and inserted a new line into the row number 114 with this content: if (arg(3) && arg(5) && arg(4)=='fields') {phptext_update_existing_nodes(arg(3), arg(5));}

    case 'save':
	  if (arg(3) && arg(5) && arg(4)=='fields') {phptext_update_existing_nodes(arg(3), arg(5));}
      return array('code');

This patched file has been uploaded here. It works for me correctly.

Instead of file attached to #1, please use this one.

Dynamic Field appear to old nodes in type where we first created it.
But don't appear to old nodes in type where we created it through Existing field.

to#2 This is no drupal code.

Drupal code must be like this:

function phptext_update_existing_nodes($type, $field) {
$sql = "SELECT nid FROM node WHERE type='$type'";
  $result = db_query ($sql);
  if ($result) {
    while ($row = db_fetch_array ($result)) {
    $node=node_load($row['nid']);
	$mod=$node->changed;
	$node->$field = array(array('value' => ''));
	node_save($node);
	db_query('UPDATE node SET changed=%d WHERE nid=%d', $mod, $row[0]);
	}
  }
drupal_set_message(t('%nodes updated.', array(
'%nodes' => format_plural($i, '1 node has been', '@count nodes have been'))));
return;
}

But, if you have a lot of nodes in the same node type you will be get a "Allow memory limit" error.

P.S. Sorry for my english.