/**
* Remove one line
*
* @param BillLine $line
*
* @return BaseBill
*/
public function removeLine(BillLine $line)
{
$this->lines->removeElement($line);
$this->totalHt -= $line->getUnitPrice() * $line->getQuantity() / (1 + $line->getDiscount() / 100);
return $this;
}