How To Fix CNV_20700238 - Duplicate records after conversion in master table (MARA):

SAP Error Message - Details

• Message type: E = Error

• Message class: CNV_20700 - Material number conversion

• Message number: 238

• Message text: Duplicate records after conversion in master table (MARA):

Self-Explanatory Message

Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of messages in the SAP system have a message text, however this is frequently insufficient to comprehend or resolve the problem.

To make things easier, more detailed information is frequently added to describe the issue, how to fix it, and the necessary steps or configuration modifications.

Unfortunately, there isn't any extra information in this error notice.

What else can you do?

First, use our AnswerBot below to get a possible cause and solution (requires a premium subscription).

Also, review the in-depth Common Questions & Answers listed below; you could discover a solution there or be able to connect with others who have faced similar challenges.

You can also try searching the SAP support portal (support.sap.com) but you need a special user ID to access it. It is possible that an SAP support note exists that provides additional details about the mistake or even steps for fixing it.

Smart SAP Assistant

• What is the cause and solution for SAP error message CNV_20700238 - Duplicate records after conversion in master table (MARA): ?

  The SAP error message CNV_20700238 indicates that there are duplicate records in the master table MARA (Material Master) after a data conversion process. This typically occurs during data migration or conversion activities, such as when using SAP's Data Migration tools or during system upgrades.
  Cause:
  
  Duplicate Data in Source System: The source system may have contained duplicate entries for materials that were not identified or cleaned up before the migration.
  Incorrect Mapping: During the conversion process, the mapping of fields may have led to the creation of duplicate records.
  Data Transformation Issues: If there are issues in the transformation logic (e.g., during ETL processes), it can lead to duplicates being created.
  Configuration Errors: Incorrect configuration settings in the migration tool or process can also lead to duplicates.
  
  Solution:
  
  
  Identify Duplicates: 
  
  Use SQL queries or SAP transaction codes (like SE16N) to identify duplicate records in the MARA table. You can check for duplicates based on key fields such as Material Number (MATNR).
  Example SQL query to find duplicates:
  SELECT MATNR, COUNT(*)
  FROM MARA
  GROUP BY MATNR
  HAVING COUNT(*) > 1;
  
  
  
  
  Data Cleansing:
  
  Clean the data in the source system to remove duplicates before migration.
  If duplicates are found post-migration, you may need to decide which records to keep and which to delete based on business rules.
  
  
  
  Adjust Mapping and Transformation Logic:
  
  Review the mapping and transformation rules used during the conversion process to ensure they are correctly set up to prevent duplicates.
  
  
  
  Use SAP Tools:
  
  Utilize SAP tools like the SAP Data Services or SAP Information Steward to help identify and cleanse duplicate data before migration.
  
  
  
  Consult Documentation:
  
  Review SAP notes and documentation related to the specific migration or conversion process you are using, as there may be specific guidelines or tools provided by SAP.
  
  
  
  Testing:
  
  After making changes, conduct thorough testing to ensure that the issue is resolved and that no new duplicates are created.
  
  
  
  Related Information:
  
  SAP Notes: Check for any relevant SAP Notes that may address this specific error or provide guidance on handling duplicates in the MARA table.
  Data Migration Best Practices: Familiarize yourself with best practices for data migration, including data profiling, cleansing, and validation techniques.
  SAP Community: Engage with the SAP Community forums for insights and experiences shared by other users who may have encountered similar issues.
  
  By following these steps, you should be able to resolve the CNV_20700238 error and ensure that your material master data is clean and free of duplicates.