fix: isAllowedForCalculation triggeres better error output

fix brassberg/ecoyn/tickets#93

src/QUI/ERP/Accounting/Calc.php

@@ -766,7 +766,7 @@ public static function calculatePayments($ToCalculate): array
                 'Calc->calculatePayments(); Object is not allowed to calculate ' . get_class($ToCalculate)
             );
 
-            throw new QUI\ERP\Exception('Object is not allowed to calculate');
+            throw new QUI\ERP\Exception('Object is not allowed to calculate ' . get_class($ToCalculate));
         }
 
         QUI\ERP\Debug::getInstance()->log(