it can happen that templates are not fully defined. This means for the matching: ``` [SystemAdapter | MEC_App] Matching: 201 | {"_links":{"self":{"href":"https://try-mec.etsi.org/sbx8uub3qx/mep1/rni/v2/subscriptions/5"}},"callbackReference":"http://my.callback.com/rni-cell-change/some-id-4","expiryDeadline":{"nanoSeconds":0,"seconds":1977836800},"filterCriteriaAssocHo":{"appInstanceId":"myApp","associateId":[{"type":1,"value":"10.100.0.1"}],"ecgi":[{"cellId":"ABC","plmn":{"mcc":"001","mnc":"01"}}],"hoStatus":[1,2]},"subscriptionType":"CellChangeSubscription"} [SystemAdapter | MEC_App] vs 201 | null ``` Replace 'null' with '?' , i.e. the appropriate wildcard