No, FirstSortedValue will find the min for you. But if that is not working, then you need to post a sample of your model so that we can looks at the why its not working (data structure or sheet object related)
You may need to do this in the load script if you have items with null or zero UnitPrice, or many items with the same (minimum) unit price. Or perhaps this works:
WHile using QVSource, I used linkedin connector and loggedin with a id. It gets authenticated but no data is shown. I dont know what to do. Please tell me how it works. I am using free version of QVSource.