How To Fix CNV_20100171 - No unambiguous assignment of posting period variant &1 to a CoA

SAP Error Message - Details

• Message type: E = Error

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

• Message number: 171

• Message text: No unambiguous assignment of posting period variant &1 to a CoA

What causes this issue?

The system found that the posting period variant &V1& does not have a
one-to-one relation with a chart of accounts.

System Response

For this reason, it is not possible to convert the values for allowed
posting periods (table T001B, transaction OB52) automatically, and the
system excludes this table from the conversion.

How to fix this error?

After the conversion, check the open posting periods for correctness
using transaction OB52.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message CNV_20100171 - No unambiguous assignment of posting period variant &1 to a CoA ?

  The SAP error message CNV_20100171 indicates that there is no unambiguous assignment of a posting period variant to a Chart of Accounts (CoA). This typically occurs during data migration or when configuring financial settings in SAP.
  Cause:
  
  Missing Assignment: The posting period variant is not assigned to the Chart of Accounts in the system.
  Ambiguous Assignment: There may be multiple assignments of the same posting period variant to different CoAs, leading to confusion in the system.
  Configuration Issues: The configuration settings in the Financial Accounting (FI) module may not be set up correctly, leading to this error.
  
  Solution:
  
  
  Check Assignments:
  
  Go to the transaction code OB29 (or navigate through the menu: SPRO > Financial Accounting > Financial Accounting Global Settings > Ledgers > Define and Assign Posting Period Variants).
  Verify that the posting period variant is correctly assigned to the relevant Chart of Accounts.
  Ensure that there are no duplicate assignments.
  
  
  
  Assign Posting Period Variant:
  
  If the posting period variant is not assigned, you can assign it by selecting the appropriate CoA and linking it to the desired posting period variant.
  
  
  
  Review Configuration:
  
  Ensure that the configuration for the posting period variant and CoA is consistent and correctly set up.
  Check for any inconsistencies in the configuration that might lead to ambiguity.
  
  
  
  Consult Documentation:
  
  Refer to SAP documentation or help notes related to the specific error message for additional guidance and troubleshooting steps.
  
  
  
  Testing:
  
  After making the necessary changes, perform a test to ensure that the error no longer occurs and that the posting periods are functioning as expected.
  
  
  
  Related Information:
  
  Transaction Codes: 
  
  OB29: To manage posting period variants.
  OB52: To maintain open and closed posting periods.
  
  
  SAP Notes: Check for any relevant SAP Notes that may provide additional insights or patches related to this error.
  User Roles: Ensure that you have the necessary authorizations to make changes to the financial configuration settings.
  
  If the issue persists after following these steps, it may be beneficial to consult with your SAP Basis or FI consultant for further assistance.