diff --git a/src/core/jsonutil.cpp b/src/core/jsonutil.cpp
index bd24b4e..095a7b0 100644
--- a/src/core/jsonutil.cpp
+++ b/src/core/jsonutil.cpp
@@ -102,8 +102,10 @@ void JsonUtil::importSales(const std::filesystem::path &filePath, Marketplace *m
 
     int source_no = jsonValues["source_no"];
     if (source_no == cashPointNo) {
-        throw std::runtime_error("Die Kassen-Nr. der zu imporierenden Daten wird von dieser Kasse "
-                                 "hier bereits verwendet.");
+        std::string ret = "Die Kassen-Nr. ";
+        ret += std::to_string(source_no);
+        ret += " der zu imporierenden Daten wird von dieser Kasse hier bereits verwendet.";
+        throw std::runtime_error(ret);
     }
 
     market->setSalesToDelete(jsonValues["source_no"]);
diff --git a/src/gui/mainwindow.cpp b/src/gui/mainwindow.cpp
index d61a95e..a94b7f1 100644
--- a/src/gui/mainwindow.cpp
+++ b/src/gui/mainwindow.cpp
@@ -504,27 +504,30 @@ void MainWindow::onImportSalesJsonActionTriggered()
 {
     QSettings settings;
 
-    auto filename = QFileDialog::getOpenFileName(this, "Umsätze/Transaktionen importieren",
+    auto filenames = QFileDialog::getOpenFileNames(this, "Umsätze/Transaktionen importieren",
                                                  QString(), "JSON Dateien (*.json)");
 
-    if (filename.isEmpty())
+    if (filenames.isEmpty())
         return;
 
+    for(auto filename: filenames) {
 #if defined(_WIN64) || defined(_WIN32)
-    fs::path filePath(filename.toStdWString());
+        fs::path filePath(filename.toStdWString());
 #else
-    fs::path filePath(filename.toStdString());
+        fs::path filePath(filename.toStdString());
 #endif
 
-    delete m_ui.salesView->model();
-    try {
-        JsonUtil::importSales(filePath, m_marketplace.get(),
-                              settings.value("global/cashPointNo").toInt());
-    } catch (std::runtime_error &err) {
-        QMessageBox(QMessageBox::Icon::Warning, "Import nicht möglich", err.what(), QMessageBox::Ok,
-                    this)
-            .exec();
+        delete m_ui.salesView->model();
+        try {
+            JsonUtil::importSales(filePath, m_marketplace.get(),
+                                settings.value("global/cashPointNo").toInt());
+        } catch (std::runtime_error &err) {
+            QMessageBox(QMessageBox::Icon::Warning, "Import nicht möglich", err.what(), QMessageBox::Ok,
+                        this)
+                .exec();
+        }
     }
+
     setSaleModel();
     updateStatLabel();
 }