Missing SSIS 2012 as an option when adding a solution item. This can be related to a known Microsoft bug with the SQL Server 2012 installer( http://pietervanhove.azurewebsites.net/?p=461 ).
Navigate to your Programs and Features list. This is accessible from your Control Panel. Check to see if these three highlighted items are installed - Microsoft Visual Studio Tools for Applications Design-Time 3.0, Microsoft Visual Studio Tools for Applications x64 Runtime 3.0 and Microsoft Visual Studio Tools for Applications x86 Runtime 3.0. See the below screen shot for an example of what SHOULD be installed on your system in order to document 2012 SSIS.
If you are missing ANY of these three items, you will need to perform a clean install of SQL Server 2012 - a repair of your instillation will NOT suffice due to a known Microsoft issue with the 2012 installer.
Before proceeding, make sure that you have access to a FULL installer for SQL Server 2012 as well as the associated product key - you may need to contact your organization’s technical support to make sure you have this installer and product key on hand before proceeding.
When you have your installer for SQL Server 2012 on the machine you will be generating documentation from as well as your product key, you will need to uninstall and then reinstall SQL Server 2012 according to either Microsoft instructions or your organization's instructions. On the 'Feature Selection' screen during the reinstall, you will need to have the below items installed at a bare minimum in order to document SSIS 2012.
SQL Server Data Tools (SSDT), Integration Services (SSIS), Client Tools SDK and Management Tools - Basic & Complete
Lastly you will need to delete the CompositionCache file after the above steps have been completed. This step should be done with the Pragmatic Workbench closed. First, use your file explorer to go to this location and find the CompositionCache.xml file and delete it. %APPDATA%\PragmaticWorks\Core If you do not see AppData, go to 'View' and enable 'Hidden.'
Once you have done these steps, you should now be able to view SSIS 2012 in your source type.