When working with Analysis Services, you will often run into the same warnings over and over as you are developing. You may want to dismiss those in lieu of future development and to clear up your build output results. These should be dismissed carefully since they are there to help you. If you wish to manage these more effectively check out this location.
Right Click on the project in solution explorer and click Edit Database.
Then go to the warnings tab and you can DeSelect warnings to trip when you are building a project.
Tread Carefully !