My apologies, Here is the
EU document. Since yours wasn't purchased on 'that day' it need not have been accepted. It states:
EU duty free liquids which have been obtained at EU airports or on board of an aircraft of an EU carrier on condition that they are packed in packed in security tamper-evident bag (STEB), inside which proof of purchase at airside at that airport on that day is displayed, as recommended by International Civil Aviation Organization ;
Note that the Americans don't accept this for transfers to US bound flights. It needs to be purchased at the airport of departure for the US after security clearance. (There are some exceptions for domestic connections to the departure airport)