Economic Operator The Economic Operator needs to aggregate data about related EO. The relationship needs also to be described. Proposal: define a new RelatedEO element with cardinality 0..n ESPDResponse 57 This may need a lot of analysis and discussion. E.g. Why not modelling the Group? Responses: 1) In certain members they would like to see the "tree" of relationships; 2) Not all the related Eos are part of a group, e.g. the non-relied upon subcontractors. Or how can we tipify the Ids? (CodeList proposed by MS: National Number, VAT Number, LEI, EUID, Duns & Bradstreet Number)