To enable FTA to understand who you have added to Lost Cousins, you need to create an entry on your individual.

On the Occupation tab of an individual, add a new record called |EVEN|Lost Cousins in the Occupation/Profession/Job Title box and in the start date field add 1911 and in the end date field add 1911.  To add another year, press the New button (2/3's the way down the page) and repeat above but with the different year entered.