Internal parameter - The report parameter is read-only and cannot be modified.

Hello,
We have an SSRS report that has an Internal parameter for the user that is logged in (gets the Report.User!UserID in custom code and assigns to parameter called Login).  We would like it to remain internal as it is for security purposes - we filter
data depending on whether or not the user has access.  We would not like it to be accessible from the URL.  The report has drill-through functionality where the user can click a link and the report is filtered on certain criteria.  This seems
to work fine in SSRS 2005, but since i have upgraded the report to SSRS 2012, I am getting the error on the drill-through:
The report parameter 'Login' is read-only and cannot be modified. (rsReadOnlyReportParameter) 
The properties in Report Manager have the "Hide" option selected.  Any help would be appreciated.  Thanks.
 

Hi Hhewson,
In Reporting Services, if you create a hidden parameter, you can set values for it on a report URL or in a subscription definition. If you set a parameter to Internal, it is not exposed in any way except in the report definition. An internal parameter must
have a default value, which can be null if the Allow null value option has been selected. Internal Parameters are not configurable by the end-user at run-time.
In your scenario, I suggest you changing internal parameter to hidden parameter to check whether the issue persists.
Reference:
In SSRS, how does an “Internal” parameter differ from a “hidden” parameter?
Hope this helps.
Regards,
Heidi Duan
Heidi Duan
TechNet Community Support

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    Details
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    ID:
    rsreadonlyreportparameter
    Source:
    microsoft.reportingservices.diagnostics.utilities.errorstrings.resources.strings
    Version:
    8.00
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