[SCH-EUSR-22] The maximum of all subsets of SendingOrReceivingEndUsers MUST be lower or equal to FullSet/SendingOrReceivingEndUsers
SCH-EUSR-22/eusr:EndUserStatisticsReport$empty or max(eusr:Subset/eusr:SendingOrReceivingEndUsers) le xs:integer(eusr:FullSet/eusr:SendingOrReceivingEndUsers)