How To Fix FDT_EXPRESSIONS889 - &1 must return only first match to be used in expression language

SAP Error Message - Details

• Message type: E = Error

• Message class: FDT_EXPRESSIONS - Formula & Derivation Tool: Expressions

• Message number: 889

• Message text: &1 must return only first match to be used in expression language

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message FDT_EXPRESSIONS889 - &1 must return only first match to be used in expression language ?

  The SAP error message FDT_EXPRESSIONS889 indicates that an expression in the context of the SAP Fiori Design Time (FDT) framework is returning multiple matches when it is expected to return only a single match. This typically occurs in scenarios where an expression is evaluated, and the system finds more than one valid result, which is not permissible in the context of the expression language being used.
  Cause:
  
  Ambiguous Expression: The expression you are using may be too broad or not specific enough, leading to multiple results being returned.
  Data Model Issues: The underlying data model may have multiple entries that match the criteria specified in the expression.
  Incorrect Logic: The logic used in the expression may not be correctly formulated to ensure it returns a single value.
  
  Solution:
  
  
  Refine the Expression: Modify the expression to be more specific. Ensure that it targets a unique entry in the data model. This may involve adding additional filters or conditions to narrow down the results.
  
  
  Check Data Model: Review the data model to understand why multiple entries are being returned. If necessary, adjust the data model or the way data is being queried to ensure that only one entry can be returned.
  
  
  Use Aggregation Functions: If applicable, consider using aggregation functions (like FIRST, LAST, SUM, etc.) to ensure that the expression can return a single value even if multiple matches exist.
  
  
  Debugging: Use debugging tools or logs to trace the execution of the expression and see what values are being returned. This can help identify why multiple matches are occurring.
  
  
  Consult Documentation: Refer to the SAP documentation for the specific expression language you are using to ensure that you are following the correct syntax and logic.
  
  
  Related Information:
  
  SAP Fiori Elements: If you are working with SAP Fiori Elements, ensure that your annotations and metadata are correctly defined to avoid ambiguity in expressions.
  Expression Language: Familiarize yourself with the specific expression language used in your context (e.g., OData, CDS views) to understand how to construct expressions properly.
  SAP Community: Consider reaching out to the SAP Community or forums for additional insights or similar experiences from other users.
  
  By addressing the ambiguity in your expression and ensuring that it is designed to return a single match, you should be able to resolve the error message FDT_EXPRESSIONS889.