Hi,
if the user is selecting the Feature "Force External Call", it will show in the Lookup-Request the "timestamp" used from VIES.
As a user, if the result does not come directly from VIES or AT.FON, i.e. from the "CDQ VAT Pool" today this part is empty, I expect at least that the result is not directly from VIES and when this record was last updated with a date (when was is added in the Pool and when was it updated the last time (can be maximum 8 weeks in the past))