Thanks you for explaining
If I understand it correctly, it means that I have to make the sum of

static const int CLIENT_VERSION =
                           1000000 * CLIENT_VERSION_MAJOR
                         +   10000 * CLIENT_VERSION_MINOR
                         +     100 * CLIENT_VERSION_REVISION
                         +       1 * CLIENT_VERSION_BUILD;


Which for clients v1.0.0.0 up to v1.1.0.0 would mean that the values of these variables are 1000000 and 10100000?
I created a new keypair for the testnet to try it out. I'm sure that part of the equation is correct.