How To Fix DD_CDS_ANALYSIS248 - Path expression can be replaced with "&1.&2"

SAP Error Message - Details

• Message type: E = Error

• Message class: DD_CDS_ANALYSIS - CDS code inspector messages

• Message number: 248

• Message text: Path expression can be replaced with "&1.&2"

What causes this issue?

Usage of the path expression <association name>.<attribute name> can be
replaced with <data source name>.<attribute name>

System Response

Usage of the association in the path expression leads to an unnecessary
LEFT OUTER JOIN on the DB level

How to fix this error?

Use the attribute directly or the path <data source name>.<attribute
name>

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message DD_CDS_ANALYSIS248 - Path expression can be replaced with "&1.&2" ?

  The SAP error message DD_CDS_ANALYSIS248 indicates that there is an issue with the path expression used in a Core Data Services (CDS) view. Specifically, the message suggests that the path expression can be simplified or replaced with a more efficient alternative, represented as "&1.&2". This typically means that the current path expression is unnecessarily complex or can be optimized.
  Cause:
  
  Complex Path Expression: The path expression in your CDS view may be using a longer or more complicated syntax than necessary.
  Redundant Joins: The expression might involve redundant joins or associations that can be simplified.
  Incorrect Syntax: There may be a syntactical error or misuse of associations in the CDS view.
  
  Solution:
  
  Review the Path Expression: Check the path expression in your CDS view and identify where it can be simplified. Look for opportunities to replace complex expressions with the suggested simpler form "&1.&2".
  Use Associations: If you are using joins, consider using associations instead, as they can help simplify the path expressions.
  Refactor the CDS View: Refactor the CDS view to use the recommended path expression. This may involve changing how you reference fields or entities in your view.
  Test the Changes: After making changes, test the CDS view to ensure that it still returns the expected results and that the error message no longer appears.
  
  Related Information:
  
  CDS Views: Core Data Services (CDS) are a way to define semantic data models in SAP. They allow for the definition of views on database tables with a focus on business semantics.
  Associations vs. Joins: Understanding the difference between associations and joins in CDS views is crucial. Associations are more flexible and can lead to simpler path expressions.
  SAP Documentation: Refer to the official SAP documentation for CDS views for best practices and examples of path expressions.
  
  Example:
  If your original path expression looks like this:
  SELECT field1, field2 FROM table1 AS t1 INNER JOIN table2 AS t2 ON t1.id = t2.id
  And the error suggests it can be simplified to:
  SELECT field1, field2 FROM table1 AS t1, table2 AS t2
  You would refactor your CDS view accordingly.
  By addressing the complexity of the path expression, you can resolve the error and improve the performance and readability of your CDS views.