Bonus yields per city (RESOLVED)

[SocialMechanic]

I feel bad constantly asking questions, but I've trial & errored the horsehocky out of this code and I can't get it to work:

    <PolicyModifiers>
        <Row PolicyType="POLICY_SM_TALL5" ModifierId="POLICY_SM_TALL5_MODIFIER" />
    </PolicyModifiers>
    <Modifiers>
        <Row>
            <ModifierId>POLICY_SM_TALL5_MODIFIER</ModifierId>
            <ModifierType>MODIFIER_PLAYER_CITIES_ADJUST_CITY_YIELD_PER_DISTRICT</ModifierType>
            <SubjectRequirementSetId>DISTRICT_CITY_CENTER</SubjectRequirementSetId>
            <SubjustStackLimit>5</SubjustStackLimit>
        </Row>
    </Modifiers>
    <ModifierArguments>
        <Row ModifierId="POLICY_SM_TALL5_MODIFIER" Name="DistrictType" Value="DISTRICT_CITY_CENTER" />
        <Row ModifierId="POLICY_SM_TALL5_MODIFIER" Name="YieldType" Value="YIELD_SCIENCE" />
        <Row ModifierId="POLICY_SM_TALL5_MODIFIER" Name="Amount" Value="4" />
    </ModifierArguments>

I'm trying to have the player gain +4 science for every city they have, up to a maximum of +20.
nothing I do seems to work. In fact, I can't get the city to gain any science at all...

 

[SocialMechanic]

Well that was nuts. I ended up having to do all of this... I feel like there is an easier way...

<Types>
        <Row Type="POLICY_SM_TALL5" Kind="KIND_POLICY" />
    </Types>
    <Policies>
        <Row PolicyType="POLICY_SM_TALL5" Name="LOC_POLICY_SM_TALL5_NAME" Description="LOC_POLICY_SM_TALL5_NAME_DESCRIPTION" PrereqCivic="CIVIC_GUILDS" GovernmentSlotType="SLOT_ECONOMIC" />
    </Policies>
    <PolicyModifiers>
        <Row PolicyType="POLICY_SM_TALL5" ModifierId="POLICY_SM_TALL5A_MODIFIER" />
        <Row PolicyType="POLICY_SM_TALL5" ModifierId="POLICY_SM_TALL5B_MODIFIER" />
        <Row PolicyType="POLICY_SM_TALL5" ModifierId="POLICY_SM_TALL5C_MODIFIER" />
        <Row PolicyType="POLICY_SM_TALL5" ModifierId="POLICY_SM_TALL5D_MODIFIER" />
    </PolicyModifiers>
    <Modifiers>
        <Row ModifierId ="POLICY_SM_TALL5A_MODIFIER" ModifierType="MODIFIER_PLAYER_ADJUST_YIELD_CHANGE" SubjectRequirementSetId="SM_TALL5A_REQUIREMENT" />
        <Row ModifierId ="POLICY_SM_TALL5B_MODIFIER" ModifierType="MODIFIER_PLAYER_ADJUST_YIELD_CHANGE" SubjectRequirementSetId="SM_TALL5B_REQUIREMENT" />
        <Row ModifierId ="POLICY_SM_TALL5C_MODIFIER" ModifierType="MODIFIER_PLAYER_ADJUST_YIELD_CHANGE" SubjectRequirementSetId="SM_TALL5C_REQUIREMENT" />
        <Row ModifierId ="POLICY_SM_TALL5D_MODIFIER" ModifierType="MODIFIER_PLAYER_ADJUST_YIELD_CHANGE" SubjectRequirementSetId="SM_TALL5D_REQUIREMENT" />
    </Modifiers>
    <ModifierArguments>
        <Row ModifierId="POLICY_SM_TALL5A_MODIFIER" Name="YieldType" Value="YIELD_SCIENCE" />
        <Row ModifierId="POLICY_SM_TALL5A_MODIFIER" Name="Amount" Value="5" />
        <Row ModifierId="POLICY_SM_TALL5B_MODIFIER" Name="YieldType" Value="YIELD_SCIENCE" />
        <Row ModifierId="POLICY_SM_TALL5B_MODIFIER" Name="Amount" Value="5" />
        <Row ModifierId="POLICY_SM_TALL5C_MODIFIER" Name="YieldType" Value="YIELD_SCIENCE" />
        <Row ModifierId="POLICY_SM_TALL5C_MODIFIER" Name="Amount" Value="5" />
        <Row ModifierId="POLICY_SM_TALL5D_MODIFIER" Name="YieldType" Value="YIELD_SCIENCE" />
        <Row ModifierId="POLICY_SM_TALL5D_MODIFIER" Name="Amount" Value="5" />
    </ModifierArguments>
    <RequirementSets>
        <Row RequirementSetId="SM_TALL5A_REQUIREMENT" RequirementSetType="REQUIREMENTSET_TEST_ALL" />
        <Row RequirementSetId="SM_TALL5B_REQUIREMENT" RequirementSetType="REQUIREMENTSET_TEST_ALL" />
        <Row RequirementSetId="SM_TALL5C_REQUIREMENT" RequirementSetType="REQUIREMENTSET_TEST_ALL" />
        <Row RequirementSetId="SM_TALL5D_REQUIREMENT" RequirementSetType="REQUIREMENTSET_TEST_ALL" />
    </RequirementSets>
    <RequirementSetRequirements>
        <Row RequirementSetId="SM_TALL5A_REQUIREMENT" RequirementId="SM_REQUIRES_1_CITIES" />
        <Row RequirementSetId="SM_TALL5B_REQUIREMENT" RequirementId="SM_REQUIRES_2_CITIES" />
        <Row RequirementSetId="SM_TALL5C_REQUIREMENT" RequirementId="SM_REQUIRES_3_CITIES" />
        <Row RequirementSetId="SM_TALL5D_REQUIREMENT" RequirementId="SM_REQUIRES_4_CITIES" />
    </RequirementSetRequirements>
    <Requirements>
        <Row RequirementId="SM_REQUIRES_1_CITIES" RequirementType="REQUIREMENT_PLAYER_HAS_AT_LEAST_NUMBER_CITIES" />
        <Row RequirementId="SM_REQUIRES_2_CITIES" RequirementType="REQUIREMENT_PLAYER_HAS_AT_LEAST_NUMBER_CITIES" />
        <Row RequirementId="SM_REQUIRES_3_CITIES" RequirementType="REQUIREMENT_PLAYER_HAS_AT_LEAST_NUMBER_CITIES" />
        <Row RequirementId="SM_REQUIRES_4_CITIES" RequirementType="REQUIREMENT_PLAYER_HAS_AT_LEAST_NUMBER_CITIES" />
    </Requirements>
    <RequirementArguments>
        <Row RequirementId="SM_REQUIRES_1_CITIES" Name="Amount" Value="1" />
        <Row RequirementId="SM_REQUIRES_2_CITIES" Name="Amount" Value="2" />
        <Row RequirementId="SM_REQUIRES_3_CITIES" Name="Amount" Value="3" />
        <Row RequirementId="SM_REQUIRES_4_CITIES" Name="Amount" Value="4" />
    </RequirementArguments>