How To Fix CNV_MBT_CWB012 - Changing the RFC destination is very critical (see long text)

SAP Error Message - Details

• Message type: E = Error

• Message class: CNV_MBT_CWB - Messages for CWB-PCL-Interface

• Message number: 012

• Message text: Changing the RFC destination is very critical (see long text)

Changing the RFC Destination
You are attemping to change the RFC destination to the execution system.
Changing this RFC destination is very critical and needs to be done very
carefully.
Change of Target Is Not Supported
Changing the target system or the target client of the RFC destination
after loading a package is not supported. Changing the target may lead
to INCONSISTENCIES in the target system and invalidates the current
package.
If the package was loaded in the wrong target system / client, the
correct process would be to deactivate the package and load a new
package in the correct execution system.
Change of Technical Settings / Login Information
You can change
The technical settings, for example usage of the database server instead
of an application server. Make sure that the target system and client
are still the same after the change to the settings.
The login information, for example change of the login language.
Changing the login user is only possible if the new user has still the
neccessary authorizations to execute the package steps

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message CNV_MBT_CWB012 - Changing the RFC destination is very critical (see long text) ?

  The SAP error message CNV_MBT_CWB012 indicates that changing the RFC (Remote Function Call) destination is critical in the context of a specific operation, often related to data migration or conversion processes. This error typically arises during the execution of a migration project, particularly when using the SAP S/4HANA Migration Cockpit or similar tools.
  Cause:
  
  Critical RFC Destination: The RFC destination being referenced is essential for the operation being performed. Changing it could disrupt the data migration process or lead to inconsistencies.
  Configuration Issues: The RFC destination may not be properly configured, or there may be issues with connectivity to the target system.
  Authorization Problems: The user executing the operation may not have the necessary authorizations to change the RFC destination.
  System Settings: The system settings may not allow for changes to critical RFC destinations during certain operations.
  
  Solution:
  
  Review RFC Configuration: Check the configuration of the RFC destination in transaction SM59. Ensure that it is correctly set up and points to the right target system.
  Consult Documentation: Refer to the long text of the error message for specific guidance on what aspects of the RFC destination are critical and should not be changed.
  Authorization Check: Ensure that the user has the necessary authorizations to perform the operation. If not, consult with your SAP security team.
  Avoid Changes During Migration: If you are in the middle of a migration or data transfer process, avoid changing the RFC destination until the process is complete.
  Contact SAP Support: If the issue persists and you cannot determine the cause, consider reaching out to SAP Support for assistance.
  
  Related Information:
  
  Transaction Codes: Familiarize yourself with relevant transaction codes such as SM59 (RFC Destinations) and SCC4 (Client Administration) for managing system settings.
  SAP Notes: Check for any SAP Notes related to the error message CNV_MBT_CWB012 for additional insights or patches that may address the issue.
  Migration Cockpit Documentation: Review the official SAP documentation for the Migration Cockpit or the specific migration tool you are using for best practices and troubleshooting steps.
  
  By following these steps, you should be able to address the error and ensure that your migration or data transfer process proceeds smoothly.