According to your description, you would like to deploy a report to a SharePoint library. However, a login dialog prompted always when you deployed the report from Business Intelligence Development Studio to sharepoint, right?
If in this case, the issue might be caused by the TargetReportServerURL for the Report Server Project is incorrect, or the SharePoint integration mode is not configured correctly.To solve the issue, please make sure the SharePoint Integrated mode is configured correctly, and the TargetReportServerURL is correct. In a SharePoint integrated mode, the TargetReportServerURL is the site URL of the SharePoint site.
- How to: Publish a Report to a SharePoint Library
- Configuring Reporting Services for SharePoint 2010 Integration
If you have any questions, please feel free to ask.
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