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SSRS: Report Actions, URL Actions and SharePoint

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I recently encountered a scenario involving a SSRS report that contains a report action to launch a sub-report.  The child / sub-report originally had two mandatory parameters and the values for these parameters were passed from the parent report to the child.  I wanted to add a third parameter to the child report that instead of being passed form the parent would default to a specific value that could be modified by the user. 

With Report Actions in SSRS, parameters are not displayed on the sub-report when it is rendered.  Therefore, the values for these parameters must either be passed from the parent report or set to a default value.  Since the parameters are not rendered, it is not possible for a user to adjust their values.

To work around this limitation, I needed to convert the Report Action to a URL Action so the additional parameter is displayed to the user.  URL actions are very simple in that you just specify the URL in the ‘Select URL’ field. 

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The challenge in my instance we determining the appropriate URL since this report resides in SharePoint and two parameters are passed from the parent to the child report.

I found a blog post that defines the general syntax for a SharePoint URL and was a helpful starting point. 

The general syntax for the URL is displayed below:

http://<SharePoint_site>/_layouts/ReportServer/RSViewerPage.aspx?rv:RelativeReportUrl=/<SharePoint_Document_Library>/<Report_Name>.rdl&rp:Month=January

To include additional parameters in the URL, simply add on additional &rp:<Param Label>=<Param Value> to the end of the URL expression.

Obviously, hard-coding a URL in the report is less than ideal.  The built-in SSRS Global variables can help make the implementation more flexible.  The following expression worked in my environment, no guarantees it will produce the correct URL in all instances.

=Replace(Globals!ReportServerUrl,”_vti_bin/ReportServer”,”_layouts/ReportServer/RSViewerPage.aspx?rv:RelativeReportUrl=”) & Replace(Globals!ReportFolder,”<SharePoint_site>”,””) & “/” & “<Report Name>.rdl” & “&rp:<Param>=” & CStr(Fields!<Param>.Value)

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