command line arguments flush after switching between builds

I work with a complex cmake-based project with several (almost) independent build targets which I added as separate builds. One of them requires command line argument which I set in the corresponding text field (Projects->Run->Command line arguments) and other doesn't need any. When I switch build from the first to the second, this field is purged, however when I back to the first build, QtC doesn't restore the command line arguments.