This can break other parts... And when you change it then apt/dpkg can see that you have different version installed as in apt repo (version string same but control data different) and they can provide "update"... Really do not edit dpkg status file if you do not know what are you doing!
I think that extras-devel has own fremantle1.3 distribution... And I think that in extras-devel & extras-testing you do not have to care about old PR 1.2 (and 1.1...) releases.