// HERE WE SHOULD CHECK THE LENGTH OF callbacks

@co_call(par_area,related_class,"getSchema", par_area=>par_area,par_class=>related_class,par_id=>-1,callback=>"coa_GetElement(cnx,callbacks,0)", representant_level=>-1);
@co_call(par_area,par_class,"getRelatedData",par_area=>par_area,par_class=>par_class,par_id=>par_id,related_class=>related_class,related_prop=>related_prop,callback=>"coa_GetElement(cnx,callbacks, 1)", dynamic_prop=>dynamic_prop);