How To Fix CNV_20100166 - Alternative account (SKB1-ALTKT) is already filled in company code &1

SAP Error Message - Details

• Message type: E = Error

• Message class: CNV_20100 - Messageclass for chart of account conversion

• Message number: 166

• Message text: Alternative account (SKB1-ALTKT) is already filled in company code &1

What causes this issue?

According to the mapping table maintenance for company code &V1&, you
want to store the previous account numbers in the alternative account
number field (SKB1-ALTKT).

System Response

The system found that this field already contains data for company code
&V1&. During the conversion, this data would be overwritten.

How to fix this error?

Check if the existing data can be overwritten.
If this is <ZH>not</> the case, go to the mapping table maintenance and
remove the <ZK>Altkt</> indicator .
If the existing data can be overwritten this message can be ignored.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message CNV_20100166 - Alternative account (SKB1-ALTKT) is already filled in company code &1 ?

  The SAP error message CNV_20100166 indicates that there is an issue with the alternative account (field SKB1-ALTKT) in the company code specified. This error typically arises during data migration or conversion processes, particularly when using the SAP S/4HANA Migration Cockpit or similar tools.
  Cause:
  The error occurs when the alternative account field (ALTKT) is already populated for the specified company code. This can happen if:
  
  The alternative account is being set for a G/L account that already has an alternative account assigned.
  There is an attempt to assign a new alternative account to a G/L account that already has one, violating the uniqueness constraint for that field.
  
  Solution:
  To resolve this error, you can take the following steps:
  
  
  Check Existing Data:
  
  Use transaction code SE16N or SE11 to check the SKB1 table (G/L account master data) for the specified company code and see if the ALTKT field is already filled.
  Identify the G/L accounts that have an alternative account assigned.
  
  
  
  Modify the Data:
  
  If you need to change the alternative account, you can either:
  
  Update the existing alternative account to the new one you want to assign.
  Clear the ALTKT field if it is not needed, and then assign the new alternative account.
  
  
  
  
  
  Data Migration/Conversion Process:
  
  If this error occurs during a migration process, ensure that your migration data does not contain duplicate alternative accounts for the same G/L accounts.
  Review the mapping and transformation rules in your migration tool to ensure that they are correctly set up.
  
  
  
  Consult Documentation:
  
  Refer to SAP documentation or notes related to the specific migration or conversion process you are using. There may be specific guidelines or best practices for handling alternative accounts.
  
  
  
  Testing:
  
  After making the necessary changes, re-run the migration or conversion process to ensure that the error is resolved.
  
  
  
  Related Information:
  
  Transaction Codes: SE16N (Data Browser), SE11 (Data Dictionary), OBD2 (Define Alternative Accounts).
  Tables: SKB1 (G/L Account Master Data).
  SAP Notes: Check for any relevant SAP Notes that may provide additional insights or solutions related to this error message.
  
  If the issue persists after following these steps, consider reaching out to your SAP support team or consulting with an SAP expert for further assistance.