[BR-63]-The Buyer electronic address (BT-49) shall have a Scheme identifier.
Stored validation assertion
normalize-space(rsm:SupplyChainTradeTransaction/ram:ApplicableHeaderTradeAgreement/ram:BuyerTradeParty/ram:URIUniversalCommunication[1]/ram:URIID/@schemeID) != '' or not (rsm:SupplyChainTradeTransaction/ram:ApplicableHeaderTradeAgreement/ram:BuyerTradeParty/ram:URIUniversalCommunication)