When I am trying to update a category through API I get
Fatal error: Uncaught SoapFault exception:  Default Product Listing Sort by does not exist in Available Product Listing Sort By.
My call is:
$catResult = $proxy->call($session, 'catalog_category.update', array(181, array( 'is_anchor' => 1, 'include_in_menu' => 0, 'available_sort_by' => "", 'default_sort_by' => "", )));
I searched but I couldn't find anything that could fix this issue. I saw that at some point it is was a reported bug...but it should be fix by now. Does anyone know what is the problem? I want that my category to have default settings set.