How To Fix AXT_MODEL159 - Select the first table field as logical key

SAP Error Message - Details

• Message type: E = Error

• Message class: AXT_MODEL -

• Message number: 159

• Message text: Select the first table field as logical key

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message AXT_MODEL159 - Select the first table field as logical key ?

  The SAP error message AXT_MODEL159, which states "Select the first table field as logical key," typically occurs in the context of data modeling or when defining a new table in the SAP system, particularly in the context of the ABAP Dictionary or when working with Core Data Services (CDS) views.
  Cause:
  This error arises when you are trying to create or modify a table or a data model, and the system requires that the first field of the table be designated as the logical key. The logical key is essential for uniquely identifying records in the table. If the first field is not set as a logical key, the system cannot ensure that each record can be uniquely identified, which is a fundamental requirement for database tables.
  Solution:
  To resolve this error, you need to ensure that the first field you define in your table or data model is set as the logical key. Here are the steps to do this:
  
  
  Open the Data Model or Table Definition: Navigate to the relevant data model or table definition in the SAP system.
  
  
  Select the First Field: Identify the first field in your table definition.
  
  
  Set as Logical Key: In the properties of the first field, ensure that it is marked as the logical key. This is usually done by checking a box or setting a property in the field definition.
  
  
  Save and Activate: After making the necessary changes, save your work and activate the table or data model.
  
  
  Test: After activation, test the table or data model to ensure that the error no longer appears and that it functions as expected.
  
  
  Related Information:
  
  Logical Key: In SAP, a logical key is a field or a combination of fields that uniquely identifies a record in a table. It is crucial for data integrity and efficient data retrieval.
  Data Dictionary (SE11): You can use transaction SE11 to create or modify database tables and their fields in the SAP Data Dictionary.
  Core Data Services (CDS): If you are working with CDS views, ensure that the annotations and definitions are correctly set to define the key fields.
  
  If you continue to experience issues after following these steps, consider checking the SAP documentation or reaching out to your SAP support team for further assistance.