[MOD] Starbase that produces income - HELP! (Please)

Hello,

Quick question!  I am trying to create a simple mod, where a new starbase module can be built that produces income without the need to be near a planet.  Here is a XML excerpt. 

    <Stats>
      <EffectType>Income</EffectType>
      <Scope>Global</Scope>
      <Target>
        <TargetType>Faction</TargetType>
      </Target>
      <BonusType>Flat</BonusType>
      <Value>10</Value>
   </Stats>

The game will not recognize "income" as a valid field input option for <EffectType>.  I have tried FactionIncome, NetIncome, GrossIncome, FactionNetIncome, and FactionGrossIncome.  Does anyone know what I need to insert into <EffectType> in order to increase total faction income?

Preferably in a way that lists this income in the government tab as actual income (as oppose to negative maintenance which i got to work quite easily).

Thanks

TheTraviler