Thank you for your reply. Unfortunately I'm not able to open the twbx on the link that you provided above. It seems it's created on the newer version. Could you please provide me with the step on how to calculate the total transaction?
Right now I don't have tableau desktop in my system,Cannot help you out in a detailed way.Sorry about that.
There are ways to open the twbx file in text editors and save them in different version and use it.