diff --git a/library/Director/Hook/PropertyModifierHook.php b/library/Director/Hook/PropertyModifierHook.php
index 7c93f160..a05a9368 100644
--- a/library/Director/Hook/PropertyModifierHook.php
+++ b/library/Director/Hook/PropertyModifierHook.php
@@ -178,7 +178,7 @@ abstract class PropertyModifierHook
         return $this->db;
     }
 
-    public function setSettings($settings)
+    public function setSettings(array $settings)
     {
         $this->settings = $settings;
         return $this;
@@ -204,6 +204,11 @@ abstract class PropertyModifierHook
         return (object) $this->settings;
     }
 
+    public function getSettings()
+    {
+        return $this->settings;
+    }
+
     /**
      * Override this method if you want to extend the settings form
      *
diff --git a/library/Director/Objects/ImportRowModifier.php b/library/Director/Objects/ImportRowModifier.php
index 36688ee4..2b0d8cc9 100644
--- a/library/Director/Objects/ImportRowModifier.php
+++ b/library/Director/Objects/ImportRowModifier.php
@@ -68,6 +68,13 @@ class ImportRowModifier extends DbObjectWithSettings
         return (object) $properties;
     }
 
+    public function setSettings($settings)
+    {
+        $settings = $this->getInstance()->setSettings((array) $settings)->getSettings();
+
+        return parent::setSettings($settings); // TODO: Change the autogenerated stub
+    }
+
     protected function beforeStore()
     {
         if (! $this->hasBeenLoadedFromDb() && $this->get('priority') === null) {
diff --git a/library/Director/Objects/ImportSource.php b/library/Director/Objects/ImportSource.php
index 8f6bcb29..2a7fdbea 100644
--- a/library/Director/Objects/ImportSource.php
+++ b/library/Director/Objects/ImportSource.php
@@ -47,6 +47,8 @@ class ImportSource extends DbObjectWithSettings implements ExportInterface
 
     private $rowModifiers;
 
+    private $loadedRowModifiers;
+
     private $newRowModifiers;
 
     /**
@@ -101,16 +103,45 @@ class ImportSource extends DbObjectWithSettings implements ExportInterface
             $object = static::create([], $db);
         }
 
-        $object->newRowModifiers = $properties['modifiers'];
-        unset($properties['modifiers']);
         $object->setProperties($properties);
         if ($id !== null) {
+            // TODO: really?
             $object->reallySet('id', $id);
         }
 
         return $object;
     }
 
+    public function setModifiers(array $modifiers)
+    {
+        if ($this->loadedRowModifiers === null) {
+            $this->loadedRowModifiers = $this->fetchRowModifiers();
+        }
+        $current = $this->loadedRowModifiers;
+        if (count($current) !== count($modifiers)) {
+            $this->newRowModifiers = $modifiers;
+        } else {
+            $i = 0;
+            $modified = false;
+            foreach ($modifiers as $props) {
+                $this->loadedRowModifiers[$i]->setProperties((array) $props);
+                if ($this->loadedRowModifiers[$i]->hasBeenModified()) {
+                    $modified = true;
+                }
+            }
+            if ($modified) {
+                // TOOD: no newRowModifiers, directly store loaded ones if diff
+                $this->newRowModifiers = $modifiers;
+            }
+        }
+    }
+
+    public function hasBeenModified()
+    {
+        return $this->newRowModifiers !== null
+            || parent::hasBeenModified();
+    }
+
     public function getUniqueIdentifier()
     {
         return $this->get('source_name');
diff --git a/library/Director/PropertyModifier/PropertyModifierGetPropertyFromOtherImportSource.php b/library/Director/PropertyModifier/PropertyModifierGetPropertyFromOtherImportSource.php
index c3166651..d57b427e 100644
--- a/library/Director/PropertyModifier/PropertyModifierGetPropertyFromOtherImportSource.php
+++ b/library/Director/PropertyModifier/PropertyModifierGetPropertyFromOtherImportSource.php
@@ -2,7 +2,6 @@
 
 namespace Icinga\Module\Director\PropertyModifier;
 
-use Icinga\Module\Director\Forms\ImportRowModifierForm;
 use Icinga\Module\Director\Hook\PropertyModifierHook;
 use Icinga\Module\Director\Objects\ImportRowModifier;
 use Icinga\Module\Director\Objects\ImportSource;
@@ -67,6 +66,24 @@ class PropertyModifierGetPropertyFromOtherImportSource extends PropertyModifierH
         ] + $extra);
     }
 
+    /**
+     * @param $settings
+     * @return PropertyModifierHook
+     * @throws \Icinga\Exception\NotFoundError
+     */
+    public function setSettings(array $settings)
+    {
+        if (isset($settings['import_source'])) {
+            $settings['import_source_id'] = ImportSource::load(
+                $settings['import_source'],
+                $this->getDb()
+            )->get('id');
+            unset($settings['import_source']);
+        }
+
+        return parent::setSettings($settings);
+    }
+
     public function transform($value)
     {
         $data = $this->getImportedData();