Issue with getting updated document Data

I am having issue with getting update document data.  Below are the details

1. Open a connection using web service call

2. Get the document reports for ex 1 Report tab

3. Login to BI launch Pad directly and added another report tab to the same document access earlier and saved the document

4. using the same restful session if I access the same document to get the reports returned one report tab instead of two.

If I create the logon token again and able to see the updates. Is there a way to get the latest data without generating logon token?