Basic forecasting problem

[ricardof84]

Hi i am using eviews 4 to build an ARMA model but when it comes time to forecast, i expand the workfile range and i try to do the forecasting i can't get it to actually forecast...

In other words, after i expand the workfile range and try to forecast i keep getting ¨NA¨ o the future obs...

extra info... it's a basic exchange rate ARMA model with monthly observations from 2005.1 to 2010.06 ...

Thanks