Add test ($conf->global->FEATURES_LEVEL >= 2) for extrafields on

detailed lines because this feature is currently bugged.
Should work when the 2 forms (predefined product and free product) will
be merged into one (planned for 3.6)

htdocs/core/lib/invoice.lib.php

@@ -132,11 +132,13 @@ function invoice_admin_prepare_head($object)
 	$head[$h][2] = 'attributes';
 	$h++;
 
+    if ($conf->global->FEATURES_LEVEL >= 2)	// FIXME This feature will works when form for predefined and free product will be merged, otherwise there is duplicate fields with same name
+    {
 	$head[$h][0] = DOL_URL_ROOT.'/compta/facture/admin/facturedet_cust_extrafields.php';
 	$head[$h][1] = $langs->trans("ExtraFieldsLines");
 	$head[$h][2] = 'attributeslines';
 	$h++;
-
+    }
 
 	complete_head_from_modules($conf,$langs,$object,$head,$h,'invoice_admin','remove');
 

htdocs/core/lib/order.lib.php

@@ -138,10 +138,13 @@ function order_admin_prepare_head($object)
 	$head[$h][2] = 'attributes';
 	$h++;
 
+    if ($conf->global->FEATURES_LEVEL >= 2)	// FIXME This feature will works when form for predefined and free product will be merged, otherwise there is duplicate fields with same name
+    {
 	$head[$h][0] = DOL_URL_ROOT.'/admin/orderdet_extrafields.php';
 	$head[$h][1] = $langs->trans("ExtraFieldsLines");
 	$head[$h][2] = 'attributeslines';
 	$h++;
+    }
 
 	complete_head_from_modules($conf,$langs,$object,$head,$h,'order_admin','remove');
 

htdocs/core/lib/propal.lib.php

@@ -136,10 +136,13 @@ function propal_admin_prepare_head($object)
     $head[$h][2] = 'attributes';
     $h++;
 
+    if ($conf->global->FEATURES_LEVEL >= 2)	// FIXME This feature will works when form for predefined and free product will be merged, otherwise there is duplicate fields with same name
+    {
     $head[$h][0] = DOL_URL_ROOT.'/comm/admin/propaldet_extrafields.php';
     $head[$h][1] = $langs->trans("ExtraFieldsLines");
     $head[$h][2] = 'attributeslines';
     $h++;
+    }
 
 	complete_head_from_modules($conf,$langs,$object,$head,$h,'propal_admin','remove');