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Duplicated records in custom CDS view in S4 hana cloud

In one of customer support  case , custom create an custom  cds view . They set delivery item cds as Primary Datasource ,   cds billing item as Associated Datasource with zero or one  relation  base on  DN number and DN item  . But   in preview, delivery item duplicated which is not the expected result from customer .

The key is the understanding for Cardinality , customer  think  billing item has been set as 0::1 relation, so  billing item always populate 0 or 1 record  for one delivery item even though multi billing items exist for one delivery item(like dropship sales) .  But the actual situation is  relation between delivery item and billing item will be translated into 0::n  relation in  SQL select .

 

The following are the testing result in one SAP internal system . I will take sales order and sales order item  as data source . There  relation is 1 to N . But I will set the cardinality as 0::1 .

 

I_SalesOrder as the primary data source and I_SalesOrderItem as Associated Datasource with cardinality as 0::1  .DataSources

DataSources

 

Since the actual relation is 1 to n , system will give a alert when checking .

 

AlertForIncorrectCardinality

AlertForIncorrectCardinality

Sale order  record duplicated  in preview  .

SaleDocumentDuplicatedInPreview

SaleDocumentDuplicatedInPreview

 

Hope this will help in understanding  view relation in custom cds view .

 

Best regards!

Jacky Liu

 

 

2 Comments
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  • Hi,  Jens,

    Thanks for your suggestion!

     

    If we take sales order item as primary data source, it is correct practice .But  the purpose of this  blog is to show  the wrong practice and explain the understanding of Cardinality .  We always guide customer with correct practice. But customer  will create custom cds view with their own understanding or bad practice .If the result  is not expected , they will  ask help from support center .

     

    Best regards!

     

    Jacky Liu

     

  • There are several whitelisted CDS views pre-delivered with SAP S/4HANA Cloud, which can be utilized to retrieve data from the SAP S/4HANA Cloud tenant.

    SAP S/4HANA Cloud also provides user with the flexibility for creating their own custom CDS views, combining various whitelisted CDS views, to meet their specific requirement of retrieving data.

    These custom CDS views can be easily exposed as OData Service (External API), which can then be utilized to fetch data from SAP S/4HANA Cloud.

     

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