ClearCase checkout fails on Unix

Checkout fails on Unix: Lets assume it uses /abc/def/1 as a working directory
First thing it does is it removes /abc/def/1 directory and than sets working directory to /abc/def/1/.. with:
command.setWorkingDirectory( new File( workingDirectory,"..").getAbsolutePath() );
But because /abc/def/1 does not exists at this point command execution fails (on Unix - I do not know how it works on Windows). It should set it to /abc/def using
command.setWorkingDirectory( workingDirectory.getParentFile() ); (as suggested by Emmanuel)

This change is to be introduced in ClearCaseCheckOutCommand.java.