/**
  * Set Purchasable
  *
  * @param ProductDBO The product that is/was purchased
  */
 public function setPurchasable(ProductDBO $productDBO)
 {
     // This function is meant to force purchasable to be a ProductDBO
     parent::setPurchasable($productDBO);
 }
 /**
  * Set Purchasable
  *
  * @param DomainServiceDBO The domain service that is/was purchased
  */
 public function setPurchasable(DomainServiceDBO $serviceDBO)
 {
     // This function is meant to force purchasable to be a DomainServiceDBO
     parent::setPurchasable($serviceDBO);
 }