What is Report Solution and Report Project?
Report Solution: Report Solution is specifically associated with the SQL SERVER DATA TOOLS or Business intelligence development studio. This is a container where developer can create multiple reporting services projects. It facilitates the users to bring all the common things under one umbrella and create projects. Each project can be unique and define their own boundaries.
Report Projects: Report project is subset of solutions. In a project you can specifically define the way to develop the report, their data sources, parameters, data sets. Each project can have multiple reports. Project can be segregated based on the business functions you are working on