How To Fix TR171 - Field & is not a key field

SAP Error Message - Details

• Message type: E = Error

• Message class: TR - Change and Transport System

• Message number: 171

• Message text: Field & is not a key field

What causes this issue?

The field "&V1&" does not exist in table "&V2&" or is not a key field.

System Response

The entry was not accepted.

How to fix this error?

Check the spelling of the field name.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message TR171 - Field & is not a key field ?

  The SAP error message TR171, which states "Field & is not a key field," typically occurs in the context of data transport or when working with table definitions in the SAP system. This error indicates that a field you are trying to use as a key field in a transport request or a data operation is not defined as a key field in the relevant database table.
  Cause:
  
  Field Definition: The field you are trying to use is not defined as a key field in the table's structure. Key fields are essential for uniquely identifying records in a database table.
  Transport Request Issues: If you are trying to transport a table or structure that includes a non-key field as a key field, this error will occur.
  Data Dictionary Changes: If there have been recent changes to the data dictionary (like adding or modifying fields), the system may not recognize the field as a key field.
  
  Solution:
  
  
  Check Table Definition:
  
  Go to the Data Dictionary (transaction SE11) and check the definition of the table in question.
  Ensure that the field you are trying to use is indeed defined as a key field. If it is not, you may need to modify the table structure to include it as a key field, if appropriate.
  
  
  
  Modify Transport Request:
  
  If you are working with a transport request, ensure that you are not trying to include non-key fields as key fields. Adjust the transport request accordingly.
  
  
  
  Consult Documentation:
  
  Review the documentation or guidelines for the specific table or structure you are working with to understand the key field requirements.
  
  
  
  Check for Dependencies:
  
  If the field is part of a composite key, ensure that all components of the key are correctly defined and included.
  
  
  
  Seek Help from Basis or ABAP Team:
  
  If you are unsure about making changes to the table structure or if the issue persists, consult with your SAP Basis or ABAP development team for assistance.
  
  
  
  Related Information:
  
  Key Fields: Key fields are crucial for database integrity and performance. They are used to uniquely identify records and are essential for indexing.
  Data Dictionary (SE11): This transaction allows you to view and modify the definitions of database tables, views, data elements, domains, etc.
  Transport Management System (TMS): This system is used to manage the transport of objects between different SAP systems (e.g., development, quality assurance, production).
  
  By following these steps, you should be able to resolve the TR171 error and ensure that your fields are correctly defined and used in your SAP environment.