How To Fix B1671 - Updates of field &1 in table &2 produce duplicate entries

SAP Error Message - Details

• Message type: E = Error

• Message class: B1 - ALE group messages

• Message number: 671

• Message text: Updates of field &1 in table &2 produce duplicate entries

What causes this issue?

The field &V1& in the table &V2& contains entries with the old logical
system name and the new logical system name. Updates of the old logical
system name produce duplicate entries of the new logical system name.
This is not allowed in the current database.

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

System Response

The current entries (&V3&) are not updated.

How to fix this error?

Decide whether an update is required. If it is, transaction BDLS cannot
be used if entries exist with the new logical system name or the old
logical system name.

Procedure for System Administrators

Check for an application-specific solution. If in doubt, contact the SAP
Support responsible for the table in question.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message B1671 - Updates of field &1 in table &2 produce duplicate entries ?

  The SAP error message B1671 indicates that an attempt to update a field in a specific table is resulting in duplicate entries. This typically occurs when the system is trying to insert or update a record in a way that violates the uniqueness constraint of the database table.
  Cause:
  
  Duplicate Key Violation: The most common cause of this error is that the operation being performed (insert or update) is trying to create a record that already exists in the database with the same key values.
  Incorrect Data Entry: There may be an issue with the data being entered, such as incorrect or duplicate values being provided for fields that are supposed to be unique.
  Concurrency Issues: If multiple users or processes are trying to update the same record simultaneously, it can lead to conflicts and duplicate entries.
  Custom Code or Enhancements: If there are custom programs, user exits, or enhancements that manipulate data in the table, they may inadvertently cause duplicates.
  
  Solution:
  
  Check for Existing Records: Before performing the update or insert operation, check the database table to see if a record with the same key already exists. You can use transaction codes like SE16 or SE11 to view the table data.
  Data Validation: Implement data validation checks in your application to ensure that the data being entered does not violate uniqueness constraints.
  Review Custom Code: If there are custom developments involved, review the code to ensure that it correctly handles existing records and does not attempt to create duplicates.
  Locking Mechanisms: If concurrency is an issue, consider implementing locking mechanisms to prevent multiple processes from updating the same record simultaneously.
  Error Handling: Implement proper error handling in your application to catch this error and provide meaningful feedback to the user.
  
  Related Information:
  
  Table Structure: Understand the structure of the table in question, including primary keys and unique indexes, to better diagnose the issue.
  Transaction Logs: Review transaction logs to identify the sequence of operations leading to the error.
  SAP Notes: Check SAP Notes for any known issues or patches related to the specific error message or the table in question.
  Support: If the issue persists, consider reaching out to SAP support for further assistance, especially if it involves standard SAP functionality.
  
  By following these steps, you should be able to identify the root cause of the B1671 error and implement a solution to prevent it from occurring in the future.