diff --git a/htdocs/core/class/commonnumrefgenerator.class.php b/htdocs/core/class/commonnumrefgenerator.class.php
index f843c599dd7..24e7991c19a 100644
--- a/htdocs/core/class/commonnumrefgenerator.class.php
+++ b/htdocs/core/class/commonnumrefgenerator.class.php
@@ -165,12 +165,4 @@ abstract class CommonNumRefGenerator
 		}
 		return $langs->trans("NotAvailable");
 	}
-
-
-	/**
-	 *  Return an example of numbering
-	 *
-	 *  @return     string      Example
-	 */
-	abstract public function getExample();
 }
diff --git a/htdocs/core/modules/product/modules_product.class.php b/htdocs/core/modules/product/modules_product.class.php
index 6e6acef9b41..bb9c206ee8a 100644
--- a/htdocs/core/modules/product/modules_product.class.php
+++ b/htdocs/core/modules/product/modules_product.class.php
@@ -129,8 +129,6 @@ abstract class ModeleProductCode extends CommonNumRefGenerator
 	 */
 	public function getToolTip($langs, $product, $type)
 	{
-		global $conf;
-
 		$langs->loadLangs(array("admin", "companies"));
 
 		$strikestart = '';
diff --git a/htdocs/product/admin/product.php b/htdocs/product/admin/product.php
index 21f64159c47..d98818b51c9 100644
--- a/htdocs/product/admin/product.php
+++ b/htdocs/product/admin/product.php
@@ -340,7 +340,7 @@ foreach ($dirproduct as $dirroot) {
 				print '<td>'.$modCodeProduct->info($langs).'</td>'."\n";
 				print '<td class="nowrap"><span class="opacitymedium">'.$modCodeProduct->getExample($langs).'</span></td>'."\n";
 
-				if (getDolGlobalString('PRODUCT_CODEPRODUCT_ADDON') && $conf->global->PRODUCT_CODEPRODUCT_ADDON == $file) {
+				if (getDolGlobalString('PRODUCT_CODEPRODUCT_ADDON') == $file) {
 					print '<td class="center">'."\n";
 					print img_picto($langs->trans("Activated"), 'switch_on');
 					print "</td>\n";