/**
* Pre-validate entities
*
* @return boolean
*/
protected function prevalidateEntities()
{
$result = parent::prevalidateEntities();
if ($result && count(array_unique($this->discountKeys)) != count($this->discountKeys)) {
$this->errorMessages[] = static::t('Could not update the discount because another discount already exists for the specified subtotal range and membership level');
$result = false;
}
return $result;
}
