++++ Officials - Pension - Pension rights acquired before entry into the service of the Communities - Transfer to the Community scheme - Obligations of the Member States - Adoption of measures enabling the transfer to take place - Detailed rules - Period allowed for submission of the request - Cannot be raised as a bar to a request submitted within the period to the Community institution in accordance with an administrative practice ( Staff Regulations of Officials, Annex VIII, Art . 11 ( 2 ) )