--- a/app/view/grid/Messwert.js	Wed Mar 25 08:33:13 2015 +0100
+++ b/app/view/grid/Messwert.js	Wed Mar 25 09:07:20 2015 +0100
@@ -31,8 +31,18 @@
     initComponent: function() {
         this.rowEditing = Ext.create('Ext.grid.plugin.RowEditing', {
             clicksToMoveEditor: 1,
-            autoCancel: false
-        });
+            autoCancel: false,
+            listeners:{
+                // Make row ineditable when readonly is set to true
+                // Normally this would belong into a controller an not the view.
+                beforeedit: function(e, o) {
+                    if (o.record.get('readonly') == true) {
+                        return false;
+                    }
+                    return true;
+                }
+            }
+         });
 
         this.plugins = [this.rowEditing];