/**
  * Create a new Quotaion to a specific Debtor
  *
  * @param integer $debtorNumber
  * @param Closure $callback
  * @return object
  * @throws Exception
  */
 public function create($debtorNumber, Closure $callback)
 {
     $debtor = new Debtor($this->client_raw);
     $debtorHandle = $debtor->getHandle($debtorNumber);
     $invoiceHandle = $this->client->CurrentInvoice_Create(['debtorHandle' => $debtorHandle])->CurrentInvoice_CreateResult;
     if (!$invoiceHandle->Id) {
         throw new Exception("Error: creating Invoice.");
     }
     $this->lines = new Line($this->client_raw, $invoiceHandle);
     call_user_func($callback, $this->lines);
     return $this->client->CurrentInvoice_GetDataArray(['entityHandles' => ['CurrentInvoiceHandle' => $invoiceHandle]])->CurrentInvoice_GetDataArrayResult;
 }