Attach file ME51N

Please, can you help me. I am using a vba script to access ME51N. When I upload the file, I can't. Session.findById("wnd[0]/titl/shellcont/shell").pressButton "%GOS_TOOLBOX" Session.findById("wnd[0]/shellcont[1]/shell").pressContextButton "CREATE_ATTA" Session.findById("wnd[0]/shellcont[1]/shell").selectContextMenuItem "PCATTA_CREA" ****

****In this part, the program stops. Not sure how to solve to do automatically by vba.