NEW YORK, Nov 21 (Reuters) - SAP AG's (SAPG.DE) business has been stable since late October when the software giant cut its outlook, a top executive said on Friday, defying signs of a worsening global economy. "It hasn't gotten any worse," SAP co-Chief Executive Leo Apotheker said during a panel discussion in New York. Later he added in an interview: "There's business out there. We continue to move ahead."