When `SaleToFutureResidentsNumber` is reported then `SaleToFutureResidentsPolicyValue` MUST exist at least once within the same context. When `SaleToFutureResidentsNumber` is reported then `SaleToFutureResidentsSalesExpenses` MUST exist at least once within the same context. When `SaleToFutureResidentsNumber` is reported then `SaleToFutureResidentsSalesIncome` MUST exist at least once within the same context. When `SaleToFutureResidentsPolicyValue` is reported then `SaleToFutureResidentsNumber` MUST exist at least once within the same context.