view - タイムスタンプ フィールドの ABAP CDS COUNT DISTINCT

Question

TIMESTAMP フィールドで DISTINCT を指定して COUNT を使用しているときに問題が発生しました。以下は私の CDS ビューです。助けてください。ConfirmedDateフィールドにCOUNTを入れたい。

 @AbapCatalog.sqlViewName: 'ZXEWMIWT'
 @AbapCatalog.compiler.compareFilter: true
 @AbapCatalog.preserveKey: true
 @AccessControl.authorizationCheck: #CHECK
 @EndUserText.label: 'Interface View for Warehouse Task detail'
 @OData.publish: true
// I* type:ddls

define view ZXEWMI_WT as select from /scwm/ordim_c as ORDIM_C {
    key ORDIM_C.lgnum as WarehouseNo,
    @UI.selectionField: [{ position: 1 }]
    @UI.lineItem: [{ position : 1 }]
    ORDIM_C.processor as Processor,
    @UI.lineItem: [{ position : 2 }]
    //count(distinct ORDIM_C.confirmed_at) as sum_wt

    **tstmp_to_dats( ORDIM_C.confirmed_at,
    abap_system_timezone( $session.client,'NULL' ),
    $session.client,
    'NULL' ) as ConfirmedDate**

}where processor <> '' 
group by lgnum, processor, confirmed_at;