By default, when you add multiple files that are contained in the same directory to the archive, IBM Rational Rhapsody® checks out and checks in the directory for these files multiple times. (You can see this on the Output window in Rational Rhapsody.)
To set it so that Rational Rhapsody check outs and checks in to the same directory for multiple files only once, set the ConfigurationManagement::ClearCase::CheckOutCheckInDirectoryOnceDuringAddToArchive property to Checked.