diff --git a/application/config/migration.php b/application/config/migration.php
index ed87acf9..28005145 100644
--- a/application/config/migration.php
+++ b/application/config/migration.php
@@ -21,7 +21,7 @@ $config['migration_enabled'] = TRUE;
 | be upgraded / downgraded to.
 |
 */
-$config['migration_version'] = 20;
+$config['migration_version'] = 28;
 
 /*
 |--------------------------------------------------------------------------
diff --git a/application/controllers/Migrate.php b/application/controllers/Migrate.php
index b47244a8..0b8bb121 100644
--- a/application/controllers/Migrate.php
+++ b/application/controllers/Migrate.php
@@ -4,7 +4,7 @@
   {
     $this->load->library('Migration');
 
-    if ( ! $this->migration->latest()) {
+    if (!$this->migration->latest()) {
       show_error($this->migration->error_string());
     }
 
diff --git a/application/migrations/024_add_column_logbookid.php b/application/migrations/024_add_column_logbookid.php
index 58147c4b..a1a811a1 100644
--- a/application/migrations/024_add_column_logbookid.php
+++ b/application/migrations/024_add_column_logbookid.php
@@ -15,6 +15,6 @@ class Migration_add_column_logbookid extends CI_Migration {
 
         public function down()
         {
-                $this->dbforge->drop_column('logbook_id', $this->config->item('table_name'));
+                echo "not possible";
         }
 }
\ No newline at end of file
diff --git a/application/migrations/025_create_logbook_table.php b/application/migrations/025_create_logbook_table.php
index 68151fab..d04d42bc 100644
--- a/application/migrations/025_create_logbook_table.php
+++ b/application/migrations/025_create_logbook_table.php
@@ -28,6 +28,6 @@ class Migration_create_logbook_table extends CI_Migration {
 
         public function down()
         {
-                $this->dbforge->drop_table('logbooks');
+                echo "not possible";
         }
 }
\ No newline at end of file
diff --git a/application/migrations/026_addfield_to_logbooks_default.php b/application/migrations/026_addfield_to_logbooks_default.php
index 04ea5229..c90b3bb9 100644
--- a/application/migrations/026_addfield_to_logbooks_default.php
+++ b/application/migrations/026_addfield_to_logbooks_default.php
@@ -15,6 +15,6 @@ class Migration_addfield_to_logbooks_default extends CI_Migration {
 
         public function down()
         {
-                $this->dbforge->drop_column('default_logbook', 'logbooks');
+                echo "not possible";
         }
 }
\ No newline at end of file
diff --git a/application/migrations/027_addfield_to_logbooks_active.php b/application/migrations/027_addfield_to_logbooks_active.php
index 7a3146d7..aeeea0e2 100644
--- a/application/migrations/027_addfield_to_logbooks_active.php
+++ b/application/migrations/027_addfield_to_logbooks_active.php
@@ -15,6 +15,6 @@ class Migration_addfield_to_logbooks_active extends CI_Migration {
 
         public function down()
         {
-                $this->dbforge->drop_column('active_logbook', 'logbooks');
+                echo "not possible";
         }
 }
\ No newline at end of file