Next War Upgrade Path

[Ultraman]

Hi! I'm trying to mod my game to allow my Modern Armor to upgrade to Assault Mechs and Dreadnoughts when they become available. Made the change in Unitsinfo.xml, as below:

<UnitClassUpgrades>
<UnitClassUpgrade>
<UnitClassUpgradeType>UNITCLASS_ASSAULT_MECH</UnitClassUpgradeType>
<bUnitClassUpgrade>1</bUnitClassUpgrade>
</UnitClassUpgrade>
<UnitClassUpgrade>
<UnitClassUpgradeType>UNITCLASS_DREADNOUGHT</UnitClassUpgradeType>
<bUnitClassUpgrade>1</bUnitClassUpgrade>
</UnitClassUpgrade>
</UnitClassUpgrades>

But nothing happens. Did I miss something, please? is there another xml file I need to edit? Please help. Thanks!