powerbuilder - Modify function of DataWindow does not work properly in PB10.5 -

so have string large sql query named sql_select. , have following code in powerbuilder 10.5:

dw_1.modify( "datawindow.table.select=' "+ sql_select + "'" ) messagebox("something", dw_1.getsqlselect()) 

i see not full query, i.e., conditions not exist! though sql_select right. problem?

you should result of dw_1.modify() call string variable. if there problem syntax, should error message in string. if there no problem modify() string remain empty.