Create new Seam Web Project:
1. File -> New -> Seam Web Project: new project dialog opens
2. Specifiy project name -> Next
3. Mark "Java Persistence" -> Next -> Next -> Next
4. Mark "Server Supplied JSF Implementation" -> Next -> Finish

5. File -> New -> Seam Generate Entities

Try to delete the project with the project content:
6. Rightclick the project -> Delete -> choose to delete the project content

Deletion fails. Error message dialog appears. Details window content:
Problems encountered while deleting resources.
Could not delete '/aa3'.
Problems encountered while deleting resources.
Problems encountered while deleting files.
Could not delete: D:\projects\workspace\seam-rhds\aa3\WebContent\WEB-INF\lib\jboss-seam-ui.jar.
Could not delete: D:\projects\workspace\seam-rhds\aa3\WebContent\WEB-INF\lib\jboss-seam.jar.
Could not delete: D:\projects\workspace\seam-rhds\aa3\WebContent\WEB-INF\lib\jboss-seam-ioc.jar.
Could not delete: D:\projects\workspace\seam-rhds\aa3\WebContent\WEB-INF\lib\jboss-seam-pdf.jar.
Could not delete: D:\projects\workspace\seam-rhds\aa3\WebContent\WEB-INF\lib\jboss-seam-remoting.jar.
Could not delete: D:\projects\workspace\seam-rhds\aa3\WebContent\WEB-INF\lib\jboss-seam-mail.jar.
Could not delete: D:\projects\workspace\seam-rhds\aa3\WebContent\WEB-INF\lib\jboss-seam-debug.jar.
Could not delete: D:\projects\workspace\seam-rhds\aa3\WebContent\WEB-INF\lib\oscache-2.3.2.jar.
Could not delete: D:\projects\workspace\seam-rhds\aa3\WebContent\WEB-INF\lib\commons-digester-1.6.jar.
Could not delete: D:\projects\workspace\seam-rhds\aa3\WebContent\WEB-INF\lib\jbpm-3.1.4.jar.
Could not delete: D:\projects\workspace\seam-rhds\aa3\WebContent\WEB-INF\lib\ajax4jsf-1.1.1-SNAPSHOT.jar.
Could not delete: D:\projects\workspace\seam-rhds\aa3\WebContent\WEB-INF\lib\commons-collections-3.1.jar.
Could not delete: D:\projects\workspace\seam-rhds\aa3\WebContent\WEB-INF\lib\jsf-facelets.jar.
Could not delete: D:\projects\workspace\seam-rhds\aa3\WebContent\WEB-INF\lib\commons-beanutils-1.7.0.jar.
Could not delete: D:\projects\workspace\seam-rhds\aa3\WebContent\WEB-INF\lib\janino-2.4.3.jar.
Could not delete: D:\projects\workspace\seam-rhds\aa3\WebContent\WEB-INF\lib\commons-jci-janino-2.4.3.jar.
Could not delete: D:\projects\workspace\seam-rhds\aa3\WebContent\WEB-INF\lib\antlr-2.7.6.jar.
Could not delete: D:\projects\workspace\seam-rhds\aa3\WebContent\WEB-INF\lib\antlr-3.0ea8.jar.
Could not delete: D:\projects\workspace\seam-rhds\aa3\WebContent\WEB-INF\lib\commons-jci-core-1.0-406301.jar.
Could not delete: D:\projects\workspace\seam-rhds\aa3\WebContent\WEB-INF\lib\drools-compiler-3.0.5.jar.
Could not delete: D:\projects\workspace\seam-rhds\aa3\WebContent\WEB-INF\lib\drools-core-3.0.5.jar.
Could not delete: D:\projects\workspace\seam-rhds\aa3\WebContent\WEB-INF\lib\stringtemplate-2.3b6.jar.
Could not delete: D:\projects\workspace\seam-rhds\aa3\WebContent\WEB-INF\lib\hsqldb.jar.
Could not delete: D:\projects\workspace\seam-rhds\aa3\WebContent\WEB-INF\lib.
Could not delete: D:\projects\workspace\seam-rhds\aa3\WebContent\WEB-INF.
Could not delete: D:\projects\workspace\seam-rhds\aa3\WebContent.
Could not delete: D:\projects\workspace\seam-rhds\aa3.
Problems encountered while deleting files.
Could not delete: D:\projects\workspace\seam-rhds\aa3\WebContent\WEB-INF\lib\jboss-seam-ui.jar.
Could not delete: D:\projects\workspace\seam-rhds\aa3\WebContent\WEB-INF\lib\jboss-seam.jar.
Could not delete: D:\projects\workspace\seam-rhds\aa3\WebContent\WEB-INF\lib\jboss-seam-ioc.jar.
Could not delete: D:\projects\workspace\seam-rhds\aa3\WebContent\WEB-INF\lib\jboss-seam-pdf.jar.
Could not delete: D:\projects\workspace\seam-rhds\aa3\WebContent\WEB-INF\lib\jboss-seam-remoting.jar.
Could not delete: D:\projects\workspace\seam-rhds\aa3\WebContent\WEB-INF\lib\jboss-seam-mail.jar.
Could not delete: D:\projects\workspace\seam-rhds\aa3\WebContent\WEB-INF\lib\jboss-seam-debug.jar.
Could not delete: D:\projects\workspace\seam-rhds\aa3\WebContent\WEB-INF\lib\oscache-2.3.2.jar.
Could not delete: D:\projects\workspace\seam-rhds\aa3\WebContent\WEB-INF\lib\commons-digester-1.6.jar.
Could not delete: D:\projects\workspace\seam-rhds\aa3\WebContent\WEB-INF\lib\jbpm-3.1.4.jar.
Could not delete: D:\projects\workspace\seam-rhds\aa3\WebContent\WEB-INF\lib\ajax4jsf-1.1.1-SNAPSHOT.jar.
Could not delete: D:\projects\workspace\seam-rhds\aa3\WebContent\WEB-INF\lib\commons-collections-3.1.jar.
Could not delete: D:\projects\workspace\seam-rhds\aa3\WebContent\WEB-INF\lib\jsf-facelets.jar.
Could not delete: D:\projects\workspace\seam-rhds\aa3\WebContent\WEB-INF\lib\commons-beanutils-1.7.0.jar.
Could not delete: D:\projects\workspace\seam-rhds\aa3\WebContent\WEB-INF\lib\janino-2.4.3.jar.
Could not delete: D:\projects\workspace\seam-rhds\aa3\WebContent\WEB-INF\lib\commons-jci-janino-2.4.3.jar.
Could not delete: D:\projects\workspace\seam-rhds\aa3\WebContent\WEB-INF\lib\antlr-2.7.6.jar.
Could not delete: D:\projects\workspace\seam-rhds\aa3\WebContent\WEB-INF\lib\antlr-3.0ea8.jar.
Could not delete: D:\projects\workspace\seam-rhds\aa3\WebContent\WEB-INF\lib\commons-jci-core-1.0-406301.jar.
Could not delete: D:\projects\workspace\seam-rhds\aa3\WebContent\WEB-INF\lib\drools-compiler-3.0.5.jar.
Could not delete: D:\projects\workspace\seam-rhds\aa3\WebContent\WEB-INF\lib\drools-core-3.0.5.jar.
Could not delete: D:\projects\workspace\seam-rhds\aa3\WebContent\WEB-INF\lib\stringtemplate-2.3b6.jar.
Could not delete: D:\projects\workspace\seam-rhds\aa3\WebContent\WEB-INF\lib\hsqldb.jar.
Could not delete: D:\projects\workspace\seam-rhds\aa3\WebContent\WEB-INF\lib.
Could not delete: D:\projects\workspace\seam-rhds\aa3\WebContent\WEB-INF.
Could not delete: D:\projects\workspace\seam-rhds\aa3\WebContent.
Could not delete: D:\projects\workspace\seam-rhds\aa3.