++++ Own resources of the European Communities - Repayment or remission of import or export duties - Regulation No 1430/79 - Temporary application - Inapplicability to an application for repayment submitted after the entry into force of the regulation in respect of duties paid prior thereto - Absence of Community rules - Application of national law - Limits - General principles of Community law - National rules imposing a mandatory time-limit of three years for the submission of applications for repayment - Whether permissible ( Council Regulation No 1430/79, Art . 27 )