FIX: Error occurs when you try to change the parameters with default values in a report in SSRS 2012 or SSRS 2014

Symptoms
Assume that you have a report that has two or more parameters in Microsoft SQL Server 2012 Reporting Service (SSRS 2012) or SQL Server 2014 Reporting Service (SSRS 2014) in SharePoint 2010 integration mode, and the parameters have default values that are defined by function expressions. For example, the default value of Parameter1 is set by the Today () function, and Parameter2 uses another function expression as its default value. When you open the report on a SharePoint site and then try to change the value of Parameter1 or Parameter2, you receive the following error message:
Report parameter values must be specified before the report can be displayed. Choose parameter values in the parameters area and click the Apply button.
Resolution
The issue was first fixed in the following cumulative update of SQL Server.

Cumulative Update 1 for SQL Server 2014 SP1

Cumulative Update 6 for SQL Server 2014

Cumulative Update 4 for SQL Server 2012 SP2

About cumulative updates for SQL Server

Each new cumulative update for SQL Server contains all the hotfixes and all the security fixes that were included with the previous cumulative update. Check out the latest cumulative updates for SQL Server:
Status
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.
Properties

Article ID: 3028226 - Last Review: 06/22/2015 14:20:00 - Revision: 3.0

Microsoft SQL Server 2012 Service Pack 2, SQL Server 2012 Reporting Services, Microsoft SQL Server 2014 Service Pack 1, Microsoft SQL Server 2014 Business Intelligence, SQL Server 2014 Reporting Services

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