Can multiple authors check out XPJ?

Environment

Windows 7 Enterprise

RoboHelp 11

Team Foundation Server

Visual Studio 2010 Professional -- Source Control

Three of us are starting to work on a Help project together. We are working from Version Control.

We will be setting up collaboration guidelines, such as, 'don't work on the same topic at the same time'.

However, when we open our projects, RoboHelp prompts us to check out the XPJ file and we are not sure what the effect is in a collaborative environment running in Source Control. Will we run into version conflicts?

The RoboHelp Help says that we don't have to check out the XPJ file when editing, only when editing project settings. However, RoboHelp won't let us click No in response to the prompt.

Thanks for any guidance on this issue.

Carol