Fixed undefined reference

wiaflos/server/core/Payments.pm

@@ -604,7 +604,7 @@ sub createPaymentAllocation
 	}
 	$paymentBalance->bsub($detail->{'Amount'});
 	if ($paymentBalance->is_neg()) {
-		setError("Creating this allocation will exceed payment '".$payment->{'PaymentNumber'}."' amount by ".$paymentBalance->bstr());
+		setError("Creating this allocation will exceed payment '".$detail->{'PaymentNumber'}."' amount by ".$paymentBalance->bstr());
 		return ERR_OVERALLOC;
 	}