++++ 1.Free movement of goods - Quantitative restrictions - Measures having equivalent effect - Reservation of a proportion of a public supply contract to undertakings located in a particular region of the national territory - Not permissible - Measure benefiting only part of domestic production - No effect ( EEC Treaty, Art . 30 ) 2.Free movement of goods - Quantitative restrictions - Measures having equivalent effect - Measure which might be regarded as aid within the meaning of Article 92 of the Treaty - Applicability of the prohibition of measures having equivalent effect not precluded by that possibility ( EEC Treaty, Arts 30 and 92 )