How To Fix CNV_CDMC_CA261 - Enter exactly one system with role 'A'

SAP Error Message - Details

• Message type: E = Error

• Message class: CNV_CDMC_CA - CDMC Clearing Analysis

• Message number: 261

• Message text: Enter exactly one system with role 'A'

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_CDMC_CA261 - Enter exactly one system with role 'A' ?

  The SAP error message CNV_CDMC_CA261 indicates that the system expects exactly one system to be defined with the role 'A' (which typically stands for "Source System" or "Active System") in the context of a data migration or conversion process. This error usually arises during the execution of a data conversion project, particularly when using the SAP S/4HANA Migration Cockpit or similar tools.
  Cause:
  The error occurs due to one of the following reasons:
  
  Multiple Systems Defined: More than one system has been defined with the role 'A'.
  No System Defined: No system has been defined with the role 'A'.
  Incorrect Configuration: The configuration settings for the systems may not be set up correctly, leading to ambiguity in identifying the active source system.
  
  Solution:
  To resolve the error, follow these steps:
  
  
  Check System Configuration:
  
  Go to the relevant transaction or configuration area where systems are defined (e.g., transaction CNV_MBT_SYSTEM).
  Verify the list of systems and their assigned roles.
  
  
  
  Ensure Exactly One Active System:
  
  If there are multiple systems with the role 'A', you need to either remove the extra entries or change their roles to something other than 'A'.
  If there is no system with the role 'A', you need to add a system and assign it the role 'A'.
  
  
  
  Save Changes:
  
  After making the necessary adjustments, save the changes and try to execute the process again.
  
  
  
  Check Documentation:
  
  Refer to the SAP documentation or notes related to the specific migration or conversion process you are working on for any additional configuration steps or requirements.
  
  
  
  Related Information:
  
  Transaction Codes: Familiarize yourself with relevant transaction codes such as CNV_MBT_SYSTEM for managing system roles.
  SAP Notes: Check for any SAP Notes that might provide additional insights or updates related to this error.
  Migration Cockpit: If you are using the SAP S/4HANA Migration Cockpit, ensure that you are following the guidelines provided in the migration guide.
  
  If the issue persists after following these steps, consider reaching out to SAP support or consulting with a technical expert who specializes in SAP migrations.