While querying BO Node: ExpenseReport - CostAssignmentView of expense report AAA in the SDK you notice there's no data maintained, even though there's Cost Assignment data maintained for the expense report in frontend.
AAA means the expense report ID.
SAP Business ByDesign
The Cost Assignment View is only filled if the user has entered a deviating cost assignment in expense report, otherwise it's not maintained.
System behaves as designed. If you want to evaluate or query the cost assignment of an expense report you must use the node Settlement Result Totals Cost Assignment View instead:
BO Node: ExpenseReport - SettlementResultTotalsCostAssignmentView
expense report; cost assignment; settlement result totals; sdk; bo; bo node; CostAssignmentView; SettlementResultTotalsCostAssignmentView , KBA , expense report , bo node , costassignmentview , cost assignment , sdk , settlement result totals , bo , settlementresulttotalscostassignmentview , AP-ERM-ER , Expense Report , How To