rtc scm cli - how to unshare or delete a root folder

Simple problem, via scm command line I try to delete a root folder in a repository workspace.

I use scm.sh (platform is linux) to login and load a repository workspace. layout is simple:

/projecta
/projecttodelete
/projectb

Then I delete via "rm projecttodelete", and start a "scm status", systems detects the missing project:

sho@linux:~/tmp/test> rm projecttodelete
sho@linux:~/tmp/test> scm status
Workspace: (1054) "sho test Workspace" <-> (1003) "test stream">
  Component: (1006) "test-source"
    Baseline: (1007) 1 "Initial Baseline"
    Unresolved:
      d-- /projecttodelete

But what now? A checkin does not work (normally you must use the parent directory when you checkin deleted ressources, that is not possible here).

I tried:

sho@linux:~/tmp/test> scm checkin projecttodelete
Problem running 'checkin':
"/home/sho/tmp/test/projecttodelete" does not exist.

This is right, as this it what I wanted.

sho@linux:~/tmp/test> scm checkin /projecttodelete
Problem running 'projecttodelete':
"/projecttodelete" is not shared.

I have not found any command like "unshare" (counterpart to share). The "-D" or "-S" parameter for checkin have no impact.

And here I'm stuck. I'm missing the CLI counterpart to "delete from repository" in eclipse. Any ideas?