My component looks like this:

(defn- domain-data [_ owner]
  (reify

    om/IInitState
    (init-state [_]
      {:domain nil})

    om/IWillMount
    (will-mount [state]
      (th/poll @chan (fn[data] (om/set-state! owner :domain data)))) ;; sets 
the state with a selected domain

    om/IRenderState
    (render-state [this state]
     (if-let [domain (:domain state)]
        (dom/div nil
                 (om/build header/header-comp domain)
                 (om/build (customer-info/create update-chan) (get-in state 
[:domain :customer-info])))
        (dom/span nil "")))))

It seems that (get-in state [:domain :customer-info]) doesn't create a cursor. 
Because some lines down the source I get

No protocol method ITransact.-transact! defined for type 
cljs.core/PersistentArrayMap

as soon as I try to call

(om/transact! app-state assoc key value);  app-state is the result of the 
get-in call

BTW:

The customer-info/app-state may look like this:
{:customer-nr "12332233", :customer "a company", :ip "122.122.1.23", 
:description "database server"} 




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