Option cross correlation in time series platform is blurred?

[#1]

I have a number of time series for which I would like to check cross correlation. In the time series platform I entered one time series as Y click OK but trying to select cross correlation in the red triangle menu it is blurred (also prewhitening & transfer function)? Did I miss something? In my data set there are no exluded/hidden rows and no missing cell values. I can't  find any guideline in the help menu..

[#2 · Accepted solution]

Those three items are only available if you have a time series in Y, and one or more time series in Input List. Usually means that you want to analyze a Transfer Function model . But you can just see cross correlation if that is what you need.