public function __construct(PaymentInstructionInterface $paymentInstruction, $amount)
{
$this->attentionRequired = false;
$this->creditedAmount = 0.0;
$this->creditingAmount = 0.0;
$this->paymentInstruction = $paymentInstruction;
$this->transactions = new ArrayCollection();
$this->reversingAmount = 0.0;
$this->state = self::STATE_NEW;
$this->targetAmount = $amount;
$this->createdAt = new \DateTime();
$this->paymentInstruction->addCredit($this);
}