Application programing in S/4HANA
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Key stone of migrating succeffully you system to S4/HANA is to understand the architecture and tools emmebed in the new version of SAP .
There's tow type od CDS view , CDS veiw and CDS-managed DDIC view :
the main difference is CDS view is not created in database and can carries more semantics.
Define CDS-managed DDIC with 'DEFINE VIEW' and we add 'AbapCatalog.sqlViewName' as annotation in the declaration script.
CDS View is declared without annotation with ' DEFINE VIEW ENTITY'