There is a way to use AMOS results correlations and standardized regression weights in order to copy and paste in an excel file and to compute AVE and CR if you need. I believe that you want to check convergent and discriminant validity. Here is the link http://statwiki.kolobkreations.com/wiki/Main_Page
You can see video tutorials and download the excel file "Stats Tools Package" http://www.kolobkreations.com/Stats%20Tools%20Package.xls
This is the best solution I found until now