Revision number using one VCS root for all projects

In our project we need one revision of whole repository for all outr builds, so we created on VCS root which is our SVN root directory and did some Checkout Rules for checking out only proper files.

But another problem occured - revision didn't updated while we set Externals support setting from Ignore externals to Checkout, but ignore changes. After this step everything is OK.

So the question is why is it so?   

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