Error While Passing SF to a web report through URL

[donv]

I was trying to pass a combination of 4 fields as Selection Formula thro a hidden field to a webreport.I am getting this error.
Error on
File :"Operation not yet implemented on pageserver" [name]
I have checked with the date being passed ,No mismatch in terms of data ie lower or uppercase.
Moreover I am passing a SF in the following format in javascript.

vk = '((1,'abc',1,1),(1,'xyz',1,1))';
hiddenfield.value = '{'+viewname+' .(f1,f2,f3,f4)'+'} in ['+vk+']
form.submit();

Please let me know if this is wrong or whether it will work
Please tell anyone.I am using CR8 and connecting to Oracle.

Thanks
donv