diff --git a/application/views/lehre/lehrauftrag/approveLehrauftrag.php b/application/views/lehre/lehrauftrag/approveLehrauftrag.php
index 350cd406a..0e3f7ea0b 100644
--- a/application/views/lehre/lehrauftrag/approveLehrauftrag.php
+++ b/application/views/lehre/lehrauftrag/approveLehrauftrag.php
@@ -105,6 +105,7 @@ $this->load->view(
                 <button id="show-ordered" class="btn btn-default" data-toggle="tooltip" data-placement="left" title="Nur bestellte anzeigen"><i class='fa fa-check-square-o'></i></button>
                 <button id="show-approved" class="btn btn-default" data-toggle="tooltip" data-placement="left" title="Nur erteilte anzeigen"><i class='fa fa-check-square'></i></button>
                 <button id="show-accepted" class="btn btn-default" data-toggle="tooltip" data-placement="left" title="Nur akzeptierte anzeigen"><i class='fa fa-handshake-o'></i></button>
+                <button id="show-changed" class="btn btn-default" data-toggle="tooltip" data-placement="left" title="Nur geänderte anzeigen"><i class='fa fa-pencil'></i></button>
                 <button id="show-dummies" class="btn btn-default" data-toggle="tooltip" data-placement="left" title="Nur verplante ohne Lektor anzeigen (Dummies)"><i class='fa fa-user-secret'></i></button>
             </div>
         </div>
@@ -148,6 +149,19 @@ $this->load->view(
         return parseFloat(headerValue) <= parseFloat(rowValue); //must return a boolean, true if it passes the filter.
     }
 
+    // -----------------------------------------------------------------------------------------------------------------
+    // Custom filters
+    // -----------------------------------------------------------------------------------------------------------------
+
+    // Filters geaenderte
+    function filter_showChanged(data){
+
+        // Filters geaenderte from status bestellt on
+        return  data.personalnummer > 0 &&          // NOT dummy lector AND
+                data.bestellt != null &&            // bestellt AND
+                data.betrag != data.vertrag_betrag; // geaendert
+    }
+
     // -----------------------------------------------------------------------------------------------------------------
     // Tabulator table format functions
     // -----------------------------------------------------------------------------------------------------------------
@@ -428,6 +442,13 @@ $(function() {
         );
     });
 
+    // Show only rows with dummy lectors
+    $("#show-changed").click(function(){
+        // needs custom filter to compare fields betrag and vertrag_betrag
+        $('#filterTabulator').tabulator('setFilter', filter_showChanged);
+    });
+
+
     $("#download-cvs").click(function(){
          $('#filterTabulator').tabulator("download", "csv", "data.csv");
      });
diff --git a/application/views/lehre/lehrauftrag/orderLehrauftrag.php b/application/views/lehre/lehrauftrag/orderLehrauftrag.php
index 9643f359d..5803d297d 100644
--- a/application/views/lehre/lehrauftrag/orderLehrauftrag.php
+++ b/application/views/lehre/lehrauftrag/orderLehrauftrag.php
@@ -105,6 +105,7 @@ $this->load->view(
                 <button id="show-ordered" class="btn btn-default" data-toggle="tooltip" data-placement="left" title="Nur bestellte anzeigen"><i class='fa fa-check-square-o'></i></button>
                 <button id="show-approved" class="btn btn-default" data-toggle="tooltip" data-placement="left" title="Nur erteilte anzeigen"><i class='fa fa-check-square'></i></button>
                 <button id="show-accepted" class="btn btn-default" data-toggle="tooltip" data-placement="left" title="Nur akzeptierte anzeigen"><i class='fa fa-handshake-o'></i></button>
+                <button id="show-changed" class="btn btn-default" data-toggle="tooltip" data-placement="left" title="Nur geänderte anzeigen"><i class='fa fa-pencil'></i></button>
                 <button id="show-dummies" class="btn btn-default" data-toggle="tooltip" data-placement="left" title="Nur verplante ohne Lektor anzeigen (Dummies)"><i class='fa fa-user-secret'></i></button>
             </div>
         </div>
@@ -148,6 +149,19 @@ $this->load->view(
         return parseFloat(headerValue) <= parseFloat(rowValue); //must return a boolean, true if it passes the filter.
     }
 
+    // -----------------------------------------------------------------------------------------------------------------
+    // Custom filters
+    // -----------------------------------------------------------------------------------------------------------------
+
+    // Filters geaenderte
+    function filter_showChanged(data){
+
+        // Filters geaenderte from status bestellt on
+        return  data.personalnummer > 0 &&          // NOT dummy lector AND
+                data.bestellt != null &&            // bestellt AND
+                data.betrag != data.vertrag_betrag; // geaendert
+    }
+
     // -----------------------------------------------------------------------------------------------------------------
     // Tabulator table format functions
     // -----------------------------------------------------------------------------------------------------------------
@@ -431,6 +445,12 @@ $(function() {
         );
     });
 
+    // Show only rows with dummy lectors
+    $("#show-changed").click(function(){
+        // needs custom filter to compare fields betrag and vertrag_betrag
+        $('#filterTabulator').tabulator('setFilter', filter_showChanged);
+    });
+
     // Show only rows with dummy lectors
     $("#show-dummies").click(function(){
         $('#filterTabulator').tabulator('setFilter',