Check out project file, Path/File access error...

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Hello,

We are working with 2 developers on a visual basic project
that is stored in a VSS database.

Our problem:
We need to check out the project file before we can run
(CTRL + F5) the program. In case my colleague has checked
out the project file before, I can not run (test) the program. I have to wait untill he checks in again.

Is it necessary to check out the project file before you
can run the program? If possible I want to avoid using the
multiple checkout option.

Thanks in advance,

Rene