diff --git a/htdocs/product/card.php b/htdocs/product/card.php
index 8eac47207cd..7c51da5d02a 100644
--- a/htdocs/product/card.php
+++ b/htdocs/product/card.php
@@ -1866,7 +1866,12 @@ if (is_object($objcanvas) && $objcanvas->displayCanvasExists($action)) {
 			print '<table class="border allwidth">';
 
 			// Ref
-			print '<tr><td class="titlefieldcreate fieldrequired">'.$langs->trans("Ref").'</td><td colspan="3"><input name="ref" class="maxwidth200" maxlength="128" value="'.dol_escape_htmltag($object->ref).'"></td></tr>';
+			if (empty($conf->global->MAIN_PRODUCT_REF_NOT_EDITABLE)) {
+				print '<tr><td class="titlefieldcreate fieldrequired">'.$langs->trans("Ref").'</td><td colspan="3"><input name="ref" class="maxwidth200" maxlength="128" value="'.dol_escape_htmltag($object->ref).'"></td></tr>';
+			} else {
+				print '<tr><td class="titlefieldcreate fieldrequired">'.$langs->trans("Ref").'</td><td colspan="3"><input name="ref" class="maxwidth200" maxlength="128" value="'.dol_escape_htmltag($object->ref).'" readonly="true"></td></tr>';
+			}
+
 
 			// Label
 			print '<tr><td class="fieldrequired">'.$langs->trans("Label").'</td><td colspan="3"><input name="label" class="minwidth300 maxwidth400onsmartphone" maxlength="255" value="'.dol_escape_htmltag($object->label).'"></td></tr>';