<Update> Issue

[Riker13]

I dont want the Harbor to increase naval production by 25% so I used the <Update> tag within Building.xml but it dont work, where have I gone wrong.

<Update>
<BuildingType>BUILDING_HARBOR</BuildingType>
<DomainType>DOMAIN_SEA</DomainType>
<Modifier>0</Modifier>

</Update>

Regards

Riker13