Drupal 7: Workaround for validation errors for same fields in multiple forms on the same page.

module.php

<?php

function MODULE_form_alter($form) {
  $form['#pre_render'][] = 'MODULE_wrap_elements';
}

function MODULE_wrap_elements($form) {
  foreach(element_children($form) as $name) {
    $form[$name] += array('#parents' => array());
    array_unshift($form[$name]['#parents'], 'container');
  }
  return $form;  
}