diff --git a/module/testcase/control.php b/module/testcase/control.php
index ec1599aa1b..8ccdf7d6ee 100644
--- a/module/testcase/control.php
+++ b/module/testcase/control.php
@@ -1860,14 +1860,6 @@ class testcase extends control
         $this->loadModel('branch');
         if($product->type != 'normal') $branches = array(BRANCH_MAIN => $this->lang->branch->main) + $this->branch->getPairs($productID, 'active', $projectID);
 
-        if($_POST)
-        {
-            $this->testcase->importFromLib($productID);
-            return print(js::reload('parent'));
-        }
-
-        $this->app->tab == 'project' ? $this->loadModel('project')->setMenu($this->session->project) : $this->testcase->setMenu($this->products, $productID, $branch);
-
         $libraries = $this->loadModel('caselib')->getLibraries();
         if(empty($libraries))
         {
@@ -1876,6 +1868,14 @@ class testcase extends control
         }
         if(empty($libID) or !isset($libraries[$libID])) $libID = key($libraries);
 
+        if($_POST)
+        {
+            $this->testcase->importFromLib($productID, $libID);
+            return print(js::reload('parent'));
+        }
+
+        $this->app->tab == 'project' ? $this->loadModel('project')->setMenu($this->session->project) : $this->testcase->setMenu($this->products, $productID, $branch);
+
         /* Build the search form. */
         $actionURL = $this->createLink('testcase', 'importFromLib', "productID=$productID&branch=$branch&libID=$libID&orderBy=$orderBy&browseType=bySearch&queryID=myQueryID");
         $this->config->testcase->search['module']    = 'testsuite';
@@ -1897,19 +1897,20 @@ class testcase extends control
         $this->view->title      = $this->lang->testcase->common . $this->lang->colon . $this->lang->testcase->importFromLib;
         $this->view->position[] = $this->lang->testcase->importFromLib;
 
-        $this->view->libraries  = $libraries;
-        $this->view->libID      = $libID;
-        $this->view->product    = $product;
-        $this->view->productID  = $productID;
-        $this->view->branch     = $branch;
-        $this->view->cases      = $this->loadModel('testsuite')->getLibCases($productID, $libID, $orderBy, $pager, $browseType, $queryID);
-        $this->view->modules    = $this->loadModel('tree')->getOptionMenu($productID, 'case', 0, $branch === 'all' ? 0 : (int)$branch);
-        $this->view->libModules = $this->tree->getOptionMenu($libID, 'caselib');
-        $this->view->pager      = $pager;
-        $this->view->orderBy    = $orderBy;
-        $this->view->branches   = $branches;
-        $this->view->browseType = $browseType;
-        $this->view->queryID    = $queryID;
+        $this->view->libraries       = $libraries;
+        $this->view->libID           = $libID;
+        $this->view->product         = $product;
+        $this->view->productID       = $productID;
+        $this->view->branch          = $branch;
+        $this->view->cases           = $this->loadModel('testsuite')->getLibCases($productID, $libID, $orderBy, $pager, $browseType, $queryID);
+        $this->view->modules         = $this->loadModel('tree')->getOptionMenu($productID, 'case', 0, $branch === 'all' ? 0 : (int)$branch);
+        $this->view->libModules      = $this->tree->getOptionMenu($libID, 'caselib');
+        $this->view->pager           = $pager;
+        $this->view->orderBy         = $orderBy;
+        $this->view->branches        = $branches;
+        $this->view->browseType      = $browseType;
+        $this->view->queryID         = $queryID;
+        $this->view->importedModules = $this->testsuite->getImportedModules($productID, $libID);
 
         $this->display();
     }
diff --git a/module/testcase/model.php b/module/testcase/model.php
index 169ab985b3..714f46cfa4 100644
--- a/module/testcase/model.php
+++ b/module/testcase/model.php
@@ -1576,19 +1576,22 @@ class testcaseModel extends model
      * Import case from Lib.
      *
      * @param  int    $productID
+     * @param  int    $libID
      * @access public
      * @return void
      */
-    public function importFromLib($productID)
+    public function importFromLib($productID, $libID = 0)
     {
         $data = fixer::input('post')->get();
 
-        $prevModule = 0;
-        $prevBranch = 0;
+        $prevModule      = 0;
+        $prevBranch      = 0;
+        $importedModules = $this->loadModel('testsuite')->getImportedModules($productID, $libID);
         foreach($data->module as $i => $module)
         {
             if($module != 'ditto') $prevModule = $module;
             if($module == 'ditto') $data->module[$i] = $prevModule;
+            if(isset($importedModules[$i][$data->module[$i]])) unset($data->caseIdList[$i]);
         }
 
         if(isset($data->branch))
diff --git a/module/testcase/view/importfromlib.html.php b/module/testcase/view/importfromlib.html.php
index f25864f2ab..8ee1c69919 100644
--- a/module/testcase/view/importfromlib.html.php
+++ b/module/testcase/view/importfromlib.html.php
@@ -65,7 +65,8 @@
           <td class='text-left' title='<?php echo $libModule?>'><?php echo $libModule;?></td>
           <td class='text-left' data-module='<?php echo $case->module?>' style='overflow:visible'>
             <?php if($i > 0) $modules['ditto'] = $lang->testcase->ditto;?>
-            <?php echo html::select("module[{$case->id}]", $modules, $i == 0 ? 0 : 'ditto', "class='form-control chosen'");?>
+            <?php $importedCaseModules = isset($importedModules[$case->id]) ? $importedModules[$case->id] : array();?>
+            <?php echo html::select("module[{$case->id}]", array_diff_key($modules, $importedCaseModules), $i == 0 ? 0 : 'ditto', "class='form-control chosen'");?>
           </td>
           <td><?php echo zget($lang->testcase->typeList, $case->type);?></td>
         </tr>
diff --git a/module/testsuite/model.php b/module/testsuite/model.php
index 33e83c4421..e6f71df1bb 100644
--- a/module/testsuite/model.php
+++ b/module/testsuite/model.php
@@ -359,6 +359,29 @@ class testsuiteModel extends model
             ->fetchAll('id');
     }
 
+    /**
+     * Get imported case modules.
+     *
+     * @param  int    $productID
+     * @param  int    $libID
+     * @param  string $orderBy
+     * @param  object $pager
+     * @access public
+     * @return array
+     */
+    public function getImportedModules($productID, $libID)
+    {
+        $importedModules = $this->dao->select('fromCaseID,module')->from(TABLE_CASE)
+            ->where('product')->eq($productID)
+            ->andWhere('lib')->eq($libID)
+            ->andWhere('fromCaseID')->ne('')
+            ->andWhere('deleted')->eq(0)
+            ->fetchGroup('fromCaseID', 'module');
+        foreach($importedModules as $fromCaseID => $modules) $importedModules[$fromCaseID] = array_combine(array_keys($modules), array_keys($modules));
+
+        return $importedModules;
+    }
+
     /**
      * Build testsuite menu.
      *