add_cultural_obsession with a saved scope as value

[Pardua]

Hi,

I'm trying to create an event to select a specific good. I want to use this selection later for add_cultural_obsession.
So at the moment it looks like this:

    option = {
        name = ssmo_goods.1.d
         g:et_cola = {
             save_scope_as = ssmo_good_scope
         }
        trigger_event = { id = sell_something.1 popup = yes}
    }

later in the event chain it is used like this

add_cultural_obsession = scope:ssmo_good_scope

But it does not work.
The log says

PostValidate of effect 'add_cultural_obsession' returned false at file: events/ssmo_sell_target_ba_events.txt line: 17
Error: has_cultural_obsession trigger [ Invalid database object 'scope:ssmo_good_scope'

So I guess, either my scope is not filled correctly or the effect does not accept a scope as input.
The Wiki just says

add_cultural_obsession = X
Where X is a goods

Can someone help me pointing to the right direction?

Thanks in advance!

Here is a picture of an overlord which I will award as price for the one who can help me