How To Fix RSRTS_CDS169 - Alias &1: nesting CAST expressions is not supported

RSRTS_CDS169 - Overview

• Message type: E = Error

• Message class: RSRTS_CDS - Messages Transient CDS Queries

• Message number: 169

• Message text: Alias &1: nesting CAST expressions is not supported

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message RSRTS_CDS169 - Alias &1: nesting CAST expressions is not supported ?

  The SAP error message RSRTS_CDS169 indicates that there is an issue with the use of nested CAST expressions in a Core Data Services (CDS) view or query. This error typically arises when you are trying to convert data types in a way that is not supported by the underlying database or the CDS framework.
  Cause
  The error occurs when:
  
  You have a CDS view or a query that includes multiple CAST operations nested within each other. For example, you might be trying to cast a field to one type and then immediately cast that result to another type.
  The database engine does not support this kind of nested casting, which can lead to ambiguity or complexity in the execution plan.
  
  Solution
  To resolve the error, you can take the following steps:
  
  
  Flatten the CAST Operations: Instead of nesting CAST operations, try to simplify your expressions. For example, if you have:
  CAST(CAST(field AS type1) AS type2)
  You should first cast