CRM 2011:Web service request SetDataSourceCredentials to Report Server http://ServerName/ReportServer failed with SoapException

This error occur when you try to open report in CRM,to solve this problem do the following:

1. Give the NetworkService the role Owner and CRMReaderRole in MSCRM_Config Database and your Organization Database.

- Open Reporting Service Configuration Manager and add the current user to Role assignment

- Remove the execution account.