I was trying to checkout a file and it went it to \"Checkout but removed\" state.
I am not able to undocheckout it and have no clue what needs to be done next.
The simplest way to resolve this is to just create a new file with the same name. Then file is not missing any more and you can undo checkout and then check out again to start fresh. On the command line:
$ cleartool ls your_file.c
your_file.c: Checkout but removed
your_file.c@@
$ touch your_file.c
$ cleartool ls your_file.c
your_file.c@@/main/branch1/branch2/14 Rule: ...whatever...
$ cleartool unco -nc your_file.c
$ cleartool co -nc your_file.c
Checked out your_file.c
$
I do not have access to clearcase any longer, so the above is just by (old) memory, but you get the idea. If you are not using the command line, just copy any file to your_file.c, undo checkout and then check out.