Take a look in the model adsman.php file in the cancelAdd method:
It should be :
$add->closed_date = date("Y-m-d H:i:s", time());
if ($add->ancStore()) {
instead of
$add->closed_date = date("Y-m-d H:i:s", time());
if ($add->store()) {
Also in the thefactory/fields/fields.lib.php file from administrator
in the FactoryFieldsTbl class add the method
/**
* Method to call ancestral store
* @since 1.5.4
*
* @return bool
*/
function ancStore(){
return parent::store();
}
or jus copy the above file

Sorin