Modding Welfare

[Random47]

I've tried to mod welfare institution in Victoria 3\game\common\institutions\00_institutions.txt like this:

institution_social_security = {
    icon = "gfx/interface/icons/institution_icons/social_security.dds"
    background_texture = "gfx/interface/illustrations/institutions/social_security.dds"
    modifier = {
        if = {
            limit = {
                is_pop_type = academics
            }
            state_welfare_payments_add = 0.1
        }
        if = {
            limit = {
                is_pop_type = bureaucrats
            }
            state_welfare_payments_add = 0.1
        }
        if = {
            limit = {
                is_pop_type = clerks
            }
            state_welfare_payments_add = 0.1
        }
        if = {
            limit = {
                is_pop_type = engineers
            }
            state_welfare_payments_add = 0.1
        }
        if = {
            limit = {
                is_pop_type = farmers
            }
            state_welfare_payments_add = 0.1
        }
        if = {
            limit = {
                is_pop_type = laborers
            }
            state_welfare_payments_add = 0.1
        }
        if = {
            limit = {
                is_pop_type = machinists
            }
            state_welfare_payments_add = 0.1
        }
        if = {
            limit = {
                is_pop_type = officers
            }
            state_welfare_payments_add = 0.1
        }
        if = {
            limit = {
                is_pop_type = soldiers
            }
            state_welfare_payments_add = 0.1
        }
    }
}

The idea is to remove rich strata (capitalists and aristocrats) from getting welfare. It didn't work. Anyone knows how it can be done? Is there any other kind of limiters for strata or pop type?