diff --git a/materiels.tar.gz b/materiels.tar.gz
index 11982c1..4ed84ab 100644
Binary files a/materiels.tar.gz and b/materiels.tar.gz differ
diff --git a/src/lib/Equipment.php b/src/lib/Equipment.php
index eafd9e1..98f9b21 100644
--- a/src/lib/Equipment.php
+++ b/src/lib/Equipment.php
@@ -200,4 +200,13 @@ class Equipment
     }
     return $eqmts_borrowed_by_cat;
   }
+
+  public function CalculateNoOwnedByDate($id, $date)
+  {
+    $entries = DB::getInstance()->firstColumn(
+      "SELECT sum(equipment_number) FROM plugin_materiels_entry WHERE kind = 'Location / Prêt' AND equipment_id = '{$id}' AND entry_date <= '{$date}';");
+    $outputs = DB::getInstance()->firstColumn(
+      "SELECT sum(equipment_number) FROM plugin_materiels_output WHERE kind = 'Retour de location / prêt' AND equipment_id = '{$id}' AND output_date <= '{$date}';");
+    return $entries - $outputs;
+  }
 }
diff --git a/src/lib/Output.php b/src/lib/Output.php
index b8234e4..d7e4b57 100644
--- a/src/lib/Output.php
+++ b/src/lib/Output.php
@@ -55,4 +55,24 @@ class Output
     }
     return true;
 	}
+
+  public function PossibilityNoOwnedEqmtOutput($id, $eqmt_number, $date)
+	{
+    $after_output_dates = DB::getInstance()->get(
+      "SELECT output_date FROM plugin_materiels_output WHERE kind = 'Retour de location / prêt' AND equipment_id = '{$id}' AND output_date > '{$date}';");
+    $output_dates = array($date);
+    foreach ($after_output_dates as $row)
+    {
+      array_push($output_dates, $row->output_date);
+    }
+    $eqmt = new Equipment;
+    foreach ($output_dates as $output_date) {
+      $borrowed_eqmt = $eqmt->CalculateNoOwnedByDate($id, $output_date);
+      if ($borrowed_eqmt - $eqmt_number < 0)
+      {
+        return false;
+      }
+    }
+    return true;
+	}
 }
diff --git a/src/templates/entrees/retour.tpl b/src/templates/entrees/retour.tpl
index 1fc3c03..f3c0b98 100644
--- a/src/templates/entrees/retour.tpl
+++ b/src/templates/entrees/retour.tpl
@@ -8,7 +8,7 @@
           {if $eqmts}
             <optgroup label="-- {$cat} --">
               {foreach from=$eqmts item="eqmt"}
-                <option value="{$eqmt.id}"{if ($selected_eqmt !== "") && ($selected_eqmt == $eqmt.id)} selected="selected"{/if}>{$eqmt.designation} - sortie: {$eqmt.borrowed}</option>
+                <option value="{$eqmt.id}"{if ($selected_eqmt !== "") && ($selected_eqmt == $eqmt.id)} selected="selected"{/if}>{$eqmt.designation} - sortie: {$eqmt.released}</option>
               {/foreach}
             </optgroup>
           {/if}
diff --git a/src/www/admin/sorties/emprunte.php b/src/www/admin/sorties/emprunte.php
index cdc3522..fc229ac 100644
--- a/src/www/admin/sorties/emprunte.php
+++ b/src/www/admin/sorties/emprunte.php
@@ -23,6 +23,35 @@ $csrf_key = 'add_output';
 
 $eqmts_by_cat = $eqmt->ListAllBorrowedByCategory();
 
+if (f('save') && $form->check($csrf_key) && !$form->hasErrors())
+{
+  $eqmt_id = f('equipment_id');
+  $eqmt_number = (int) f('equipment_number');
+  $output_date_format = date_create_from_format(
+    "d/m/Y", f('output_date'))->format("Y-m-d");
+  if ($output->PossibilityNoOwnedEqmtOutput($eqmt_id, $eqmt_number, $output_date_format))
+  {
+    $output->add([
+      'kind' => 'Retour de location / prêt',
+      'equipment_number' => $eqmt_number,
+      'equipment_id' => $eqmt_id,
+      'output_date' => $output_date_format,
+      'additional_comment' => f('additional_comment'),
+    ]);
+    Utils::redirect(PLUGIN_URL . 'sorties/index.php');
+  } else
+  {
+    $output_date = f('output_date');
+    $selected_eqmt = $eqmt_id;
+    $default_date = $output_date;
+    $default_comment = f('additional_comment');
+
+    $equiment = $eqmt->get($eqmt_id);
+    $form->addError(
+      "Il est impossible de sortir " . (string) $eqmt_number . " " . $equiment->designation . " à la date du " . (string) $output_date . '.');
+  }
+}
+
 $cancel_link = PLUGIN_URL . 'sorties/index.php';
 $legend_part = "emprunté";
 $tpl_materiel_name = "emprunte";