update t_im_mdc_omoutbillentry  a set foperationdesc = (SELECT fname from t_mpdm_workprocedure_l b where b.fid =a.fworkprocedureid and b.flocaleid ='zh_CN') 
	where  exists (SELECT fname from t_mpdm_workprocedure_l b where b.fid =a.fworkprocedureid and b.flocaleid ='zh_CN');