GP Reports Viewer build 4 for Dynamics GP 2013 has been tested with Dynamics GP 2013 R2 and is compatible. You may find that some of the menu icons are not where they used to be. This was caused by the addition of the new menu ribbon in GP 2013 R2. If you prefer to see the old menus, you can change this under User Preferences - this is a per-user setting.
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