diff --git a/library/src/calculator_functions.cpp b/library/src/calculator_functions.cpp
index 551d737..1962106 100644
--- a/library/src/calculator_functions.cpp
+++ b/library/src/calculator_functions.cpp
@@ -499,19 +499,8 @@ double Calculator::GetCostFromDuration(Configuration* cfg,
                 } else {
                     // it might be that in such a case even prepaid ("vorkauf")
                     // is not allowed at any moment
-                    // added e.g. for neuhauser-linsinger maschinenbau (741):
-                    // the buying of food stamps ("essensmarken") is not allowed
-                    // at any moment
-                    CalcState cs = isParkingAllowed(cfg, start_datetime);
-                    if (cs) {
-                        end_datetime = start_datetime.addSecs(durationMinutes*60);
-                        double cost = GetCostFromDuration(cfg, start_datetime, end_datetime);
-                        end_datetime = start_datetime;
-                        end_datetime.setTime(cs.getAllowedTimeRange().getTimeUntil());
-                        return cost;
-                    }
                 }
-
+                qCritical() << "(" << __func__ << ":" << __LINE__ << ")" << "NOT YET IMPLEMENTED";
                 end_datetime = QDateTime();
                 return 0;
             }