Hi, I'm new to Jaspersoft, so my apologies in advance if my question applies more broadly and I'm posting in the wrong place. I'm trying to use a web service in Jaspersoft that needs a call to its Login function first. That function receives a username and password, and returns a temporary access token. That token can be used to issue another function call later that will return actual data for the report. So far I've done the following: I created a "Login" sub-report. Use the web service data adapter, point it to the Login method, provide credentials etc. The token gets stored in the field called "token".I added a variable to that sub-report, called "accessToken", whose Expression is set to $F{token}. I can see that the correct value gets stored if I add a text field and set its expression to $V{accessToken}.I created the main report and added the sub-report to the first band. I also added an "accessToken" variable there as well. For sub-report properties, under Return Values, I set From and To to "accessToken", hoping that main report's access token varialble will be populated with the data from the sub-report.Lastly, in the Query Dialog of the main report, I set the Base URL to something like GetEmployees?accessToken=$V{accessToken} - this should return a JSON of a list of employees, if the access token is valid. However, when I try to get the server's response, I get an exception, and it looks like $V{accessToken} doesn't get substituted with the actual token value.Is my approach generally correct? How can I use the data obtained from a sub-report in a call to another web service function? Thank you!