/**
  * Set Quotation Line product by product number
  *
  * @param  mixed $quotationLineHandle
  * @param  integer $product
  * @return boolean
  */
 public function product($quotationLineHandle, $product)
 {
     $products = new Product($this->client_raw);
     $productHandle = $products->getHandle($product);
     $this->client->QuotationLine_SetProduct(['quotationLineHandle' => $quotationLineHandle, 'valueHandle' => $productHandle]);
     return true;
 }