diff --git a/module/productplan/control.php b/module/productplan/control.php
index 56b6ab3845..1344fa2b5b 100644
--- a/module/productplan/control.php
+++ b/module/productplan/control.php
@@ -313,7 +313,7 @@ class productplan extends control
         $this->view->canBeChanged = $canBeChanged;
 
         if($this->app->getViewType() == 'json')
-        {   
+        {
             unset($this->view->storyPager);
             unset($this->view->bugPager);
         }
diff --git a/module/productplan/js/create.js b/module/productplan/js/create.js
index 080a8d0581..bc8e174472 100644
--- a/module/productplan/js/create.js
+++ b/module/productplan/js/create.js
@@ -41,7 +41,6 @@ function computeEndDate(delta)
 
 $('#begin').on('change', function()
 {
-    $("#end").val('');
     $("input:radio[name='delta']").attr("checked",false);
 });
 
@@ -55,11 +54,11 @@ $('#future').on('change', function()
     if($(this).prop('checked'))
     {
         $('#begin').attr('disabled', 'disabled');
-        $('#end').val('').parents('tr').hide();
+        $('#end').attr('disabled', 'disabled').parents('tr').hide();
     }
     else
     {
         $('#begin').removeAttr('disabled');
-        $('#end').val('').parents('tr').show();
+        $('#end').removeAttr('disabled').parents('tr').show();
     }
 });
diff --git a/module/productplan/lang/de.php b/module/productplan/lang/de.php
index bb038601fd..e34fffe508 100644
--- a/module/productplan/lang/de.php
+++ b/module/productplan/lang/de.php
@@ -77,10 +77,12 @@ $lang->productplan->endList[93]   = '3 Monate';
 $lang->productplan->endList[186]  = '6 Monate';
 $lang->productplan->endList[365]  = '1 Jahr';
 
-$lang->productplan->errorNoTitle = 'ID %s Titel darf nicht leer sein.';
-$lang->productplan->errorNoBegin = 'ID %s Start darf nicht leer sein.';
-$lang->productplan->errorNoEnd   = 'ID %s Ende darf nicht leer sein.';
-$lang->productplan->beginGeEnd   = 'ID %s Start darf nicht größer als Ende sein.';
+$lang->productplan->errorNoTitle      = 'ID %s Titel darf nicht leer sein.';
+$lang->productplan->errorNoBegin      = 'ID %s Start darf nicht leer sein.';
+$lang->productplan->errorNoEnd        = 'ID %s Ende darf nicht leer sein.';
+$lang->productplan->beginGeEnd        = 'ID %s Start darf nicht größer als Ende sein.';
+$lang->productplan->beginLetterParent = "Parent begin date: %s, begin date should be >= parent begin date.";
+$lang->productplan->endGreaterParent  = "Parent end date: %s, end date should be <= parent end date.";
 
 $lang->productplan->featureBar['browse']['all']       = 'Alle';
 $lang->productplan->featureBar['browse']['unexpired'] = 'Nicht abgelaufen';
diff --git a/module/productplan/lang/en.php b/module/productplan/lang/en.php
index f277c7fbbc..9fccee19f4 100644
--- a/module/productplan/lang/en.php
+++ b/module/productplan/lang/en.php
@@ -78,10 +78,12 @@ $lang->productplan->endList[93]   = '3 Months';
 $lang->productplan->endList[186]  = '6 Months';
 $lang->productplan->endList[365]  = '1 Year';
 
-$lang->productplan->errorNoTitle = 'ID %s title should not be empty.';
-$lang->productplan->errorNoBegin = 'ID %s begin time should not be empty.';
-$lang->productplan->errorNoEnd   = 'ID %s end time should not be empty.';
-$lang->productplan->beginGeEnd   = 'ID %s begin time should not be >= end time.';
+$lang->productplan->errorNoTitle      = 'ID %s title should not be empty.';
+$lang->productplan->errorNoBegin      = 'ID %s begin time should not be empty.';
+$lang->productplan->errorNoEnd        = 'ID %s end time should not be empty.';
+$lang->productplan->beginGeEnd        = 'ID %s begin time should not be >= end time.';
+$lang->productplan->beginLetterParent = "Parent begin date: %s, begin date should be >= parent begin date.";
+$lang->productplan->endGreaterParent  = "Parent end date: %s, end date should be <= parent end date.";
 
 $lang->productplan->featureBar['browse']['all']       = 'All';
 $lang->productplan->featureBar['browse']['unexpired'] = 'Unexpired';
diff --git a/module/productplan/lang/fr.php b/module/productplan/lang/fr.php
index da702ba7d7..33daa590c5 100644
--- a/module/productplan/lang/fr.php
+++ b/module/productplan/lang/fr.php
@@ -77,10 +77,12 @@ $lang->productplan->endList[93]   = '3 Mois';
 $lang->productplan->endList[186]  = '6 Mois';
 $lang->productplan->endList[365]  = '1 Année';
 
-$lang->productplan->errorNoTitle = 'ID %s titre ne doit pas être à blanc.';
-$lang->productplan->errorNoBegin = "ID %s l'heure de début devrait être renseignée.";
-$lang->productplan->errorNoEnd   = "ID %s l'heure de fin devrait être renseignée.";
-$lang->productplan->beginGeEnd   = "ID %s l'heure de début ne doit pas être >= à l'heure de fin.";
+$lang->productplan->errorNoTitle      = 'ID %s titre ne doit pas être à blanc.';
+$lang->productplan->errorNoBegin      = "ID %s l'heure de début devrait être renseignée.";
+$lang->productplan->errorNoEnd        = "ID %s l'heure de fin devrait être renseignée.";
+$lang->productplan->beginGeEnd        = "ID %s l'heure de début ne doit pas être >= à l'heure de fin.";
+$lang->productplan->beginLetterParent = "Parent begin date: %s, begin date should be >= parent begin date.";
+$lang->productplan->endGreaterParent  = "Parent end date: %s, end date should be <= parent end date.";
 
 $lang->productplan->featureBar['browse']['all']       = 'Tous';
 $lang->productplan->featureBar['browse']['unexpired'] = 'Non échus';
diff --git a/module/productplan/lang/vi.php b/module/productplan/lang/vi.php
index ce12fba817..c5ee987c72 100644
--- a/module/productplan/lang/vi.php
+++ b/module/productplan/lang/vi.php
@@ -77,10 +77,12 @@ $lang->productplan->endList[93]   = '3 tháng';
 $lang->productplan->endList[186]  = '6 tháng';
 $lang->productplan->endList[365]  = '1 năm';
 
-$lang->productplan->errorNoTitle = 'Tiêu đề ID %s không nên trống.';
-$lang->productplan->errorNoBegin = 'Thời gian bắt đầu ID %s không nên trống.';
-$lang->productplan->errorNoEnd   = 'Thời gian kết thúc ID %s không nên trống.';
-$lang->productplan->beginGeEnd   = 'ID %s thời gian bắt đầu không nên >= thời gian kết thúc.';
+$lang->productplan->errorNoTitle      = 'Tiêu đề ID %s không nên trống.';
+$lang->productplan->errorNoBegin      = 'Thời gian bắt đầu ID %s không nên trống.';
+$lang->productplan->errorNoEnd        = 'Thời gian kết thúc ID %s không nên trống.';
+$lang->productplan->beginGeEnd        = 'ID %s thời gian bắt đầu không nên >= thời gian kết thúc.';
+$lang->productplan->beginLetterParent = "Parent begin date: %s, begin date should be >= parent begin date.";
+$lang->productplan->endGreaterParent  = "Parent end date: %s, end date should be <= parent end date.";
 
 $lang->productplan->featureBar['browse']['all']       = 'Tất cả';
 $lang->productplan->featureBar['browse']['unexpired'] = 'Chưa quá hạn';
diff --git a/module/productplan/lang/zh-cn.php b/module/productplan/lang/zh-cn.php
index 7414100754..f4edb9e170 100644
--- a/module/productplan/lang/zh-cn.php
+++ b/module/productplan/lang/zh-cn.php
@@ -78,10 +78,13 @@ $lang->productplan->endList[93]  = '三个月';
 $lang->productplan->endList[186] = '半年';
 $lang->productplan->endList[365] = '一年';
 
-$lang->productplan->errorNoTitle = 'ID %s 标题不能为空';
-$lang->productplan->errorNoBegin = 'ID %s 开始时间不能为空';
-$lang->productplan->errorNoEnd   = 'ID %s 结束时间不能为空';
-$lang->productplan->beginGeEnd   = 'ID %s 开始时间不能大于结束时间';
+$lang->productplan->errorNoTitle      = 'ID %s 标题不能为空';
+$lang->productplan->errorNoBegin      = 'ID %s 开始时间不能为空';
+$lang->productplan->errorNoEnd        = 'ID %s 结束时间不能为空';
+$lang->productplan->beginGeEnd        = 'ID %s 开始时间不能大于结束时间';
+$lang->productplan->beginLetterParent = "父计划的开始日期：%s，开始日期不能小于父计划的开始日期";
+$lang->productplan->endGreaterParent  = "父计划的完成日期：%s，完成日期不能大于父计划的完成日期";
+
 
 $lang->productplan->featureBar['browse']['all']       = '全部';
 $lang->productplan->featureBar['browse']['unexpired'] = '未过期';
diff --git a/module/productplan/lang/zh-tw.php b/module/productplan/lang/zh-tw.php
index 60d1238dd2..4c3a56dbc1 100644
--- a/module/productplan/lang/zh-tw.php
+++ b/module/productplan/lang/zh-tw.php
@@ -78,10 +78,12 @@ $lang->productplan->endList[93]  = '三個月';
 $lang->productplan->endList[186] = '半年';
 $lang->productplan->endList[365] = '一年';
 
-$lang->productplan->errorNoTitle = 'ID %s 標題不能為空';
-$lang->productplan->errorNoBegin = 'ID %s 開始時間不能為空';
-$lang->productplan->errorNoEnd   = 'ID %s 結束時間不能為空';
-$lang->productplan->beginGeEnd   = 'ID %s 開始時間不能大於結束時間';
+$lang->productplan->errorNoTitle      = 'ID %s 標題不能為空';
+$lang->productplan->errorNoBegin      = 'ID %s 開始時間不能為空';
+$lang->productplan->errorNoEnd        = 'ID %s 結束時間不能為空';
+$lang->productplan->beginGeEnd        = 'ID %s 開始時間不能大於結束時間';
+$lang->productplan->beginLetterParent = "父計畫的開始日期：%s，開始日期不能小於父計畫的開始日期";
+$lang->productplan->endGreaterParent  = "父計畫的完成日期：%s，完成日期不能大於父計畫的完成日期";
 
 $lang->productplan->featureBar['browse']['all']       = '全部';
 $lang->productplan->featureBar['browse']['unexpired'] = '未過期';
diff --git a/module/productplan/model.php b/module/productplan/model.php
index 7a026dcc0a..76cabb9a9f 100644
--- a/module/productplan/model.php
+++ b/module/productplan/model.php
@@ -332,6 +332,18 @@ class productplanModel extends model
             ->setIF($this->post->future || empty($_POST['end']), 'end', '2030-01-01')
             ->remove('delta,uid,future')
             ->get();
+
+        if(!empty($plan->parentBegin))
+        {
+            if($plan->begin < $plan->parentBegin) dao::$errors['begin'] = sprintf($this->lang->productplan->beginLetterParent, $plan->parentBegin);
+        }
+        if(!empty($plan->parentEnd))
+        {
+            if($plan->end !=='2030-01-01' and $plan->end > $plan->parentEnd) dao::$errors['end'] = sprintf($this->lang->productplan->endGreaterParent, $plan->parentEnd);
+        }
+        unset($plan->parentBegin);
+        unset($plan->parentEnd);
+
         if(!$this->post->future and strpos($this->config->productplan->create->requiredFields, 'begin') !== false and empty($_POST['begin']))
         {
             dao::$errors['begin'] = sprintf($this->lang->error->notempty, $this->lang->productplan->begin);
diff --git a/module/productplan/view/create.html.php b/module/productplan/view/create.html.php
index e5d12a7a27..e973129590 100644
--- a/module/productplan/view/create.html.php
+++ b/module/productplan/view/create.html.php
@@ -20,12 +20,15 @@
       <h2> <?php echo $parent ? $lang->productplan->createChildren : $lang->productplan->create;?></h2>
     </div>
     <form class='load-indicator main-form form-ajax' method='post' target='hiddenwin' id='dataform'>
-      <table class='table table-form'> 
+      <table class='table table-form'>
         <tbody>
           <?php if($parent):?>
           <tr>
             <th><?php echo $lang->productplan->parent;?></th>
-            <td class='muted'><?php echo $parentPlan->title;?></td><td></td><td></td>
+            <td class='muted'><?php echo $parentPlan->title;?>
+            <?php echo html::hidden('parentBegin', $parentPlan->begin);?>
+            <?php echo html::hidden('parentEnd', $parentPlan->end);?>
+            </td><td></td><td></td>
           </tr>
           <?php else:?>
           <tr>
@@ -48,7 +51,7 @@
             <th><?php echo $lang->productplan->begin;?></th>
             <td><?php echo html::input('begin', formatTime($begin), "class='form-control form-date'");?></td>
             <td>
-              <div class='checkbox-primary'> 
+              <div class='checkbox-primary'>
                 <input type='checkbox' id='future' name='future' value='1' />
                 <label for='future'><?php echo $lang->productplan->future;?></label>
               </div>