Hi,
you have created an index, but it seeems, that it still doesn't exist on the database. That's why it doesn't work yet. Go to the index overview, right-click the new index and try option CREATE.
The init flags can be set in SE11 for structure CI_AUFK with Extras-> DB Attributes -> Initialization Flag On/Off. If they are set to on, you cold it see in AUFK (look at your 1st picture 3rd column).
Regards,
Klaus