/**
  * Set Quotation Line discount
  *
  * @param  mixed $quotationLineHandle
  * @param  float $discount
  * @return boolean
  */
 public function discount($quotationLineHandle, $discount)
 {
     $this->client->QuotationLine_SetDiscountAsPercent(['quotationLineHandle' => $quotationLineHandle, 'value' => $discount]);
     return true;
 }