When RCPTT Maven plugin runs tests, it copies project contents to "target" folder. Therefore, after running tests with maven locally and refreshing project in RCPTT IDE would produce a lot of errors related to duplicate resource IDs. 

To workaround this, it is recommended to add a resource filter in RCPTT project:

     
  1. Right-click project and select Properties
    2.  
  2. Open Resource -> Filters property page
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  3. Click Add... to add a new filter    
           
    • Filter type: Exclude all
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    • Applies to: Folders
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    • File and folder attributes: Name matches target
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  4. Apply changes, wait for a workspace refresh
    5.  
  5. If  Problems view still shows duplicate ID errors, select Project -> Clean in main menu and clean all projects