++++ Tax provisions - Harmonization of laws - Turnover taxes - Common system of value-added tax - Deduction of input tax paid - Obligations of the taxable person - Holding of an invoice containing certain information - Additional particulars required by Member States - Whether permissible - Conditions ( Council Directive 77/388/EEC, Articles 18 ( 1 ) ( a ) and 22 ( 3 ) ( a ) and ( b ) and ( 8 ) )