How To Fix CNV_10020668 - &1 &2: Specific function module &3 has wrong interface

SAP Error Message - Details

• Message type: E = Error

• Message class: CNV_10020 - Message class for package 10020

• Message number: 668

• Message text: &1 &2: Specific function module &3 has wrong interface

What causes this issue?

Specific function module &V3& has been stored for &V1& &V2&. However the
interface is not defined correctly.

How to fix this error?

Correct the interface definition of function module &V3&. <ZH>Note that
it must be EXACTLY the same as for sample function module &V4&</>,
because internally the call is explicitly included in the coding.
<ZH>Note:</> The program for checking the interface definition compares
the definition for function module &V3& with the one for sample
functionmodule &V4&. This is also why the interface parameters have to
have exactly the same names.
The best solution is to copy function module &V4& to the function module
you want to use.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message CNV_10020668 - &1 &2: Specific function module &3 has wrong interface ?

  The SAP error message CNV_10020668 indicates that there is an issue with a specific function module in the system, where the interface of the function module does not match the expected parameters or structure. This error typically arises during data migration or conversion processes, especially when using SAP's Data Migration tools or during system upgrades.
  Cause:
  
  
  Mismatch in Function Module Interface: The function module specified in the error message has an interface that does not match what is expected by the calling program or process. This could be due to:
  
  Changes in the function module's signature (parameters added, removed, or changed).
  The function module being incorrectly implemented or not activated.
  Version differences between the source and target systems.
  
  
  
  Custom Development: If the function module is a custom development, it may not have been updated correctly after changes to the underlying data structures or business logic.
  
  
  Transport Issues: If the function module was transported from another system, it may not have been transported correctly, leading to inconsistencies.
  
  
  Solution:
  
  
  Check Function Module Interface: 
  
  Go to transaction SE37 (Function Builder) and check the interface of the function module mentioned in the error message. Ensure that the parameters match what is expected by the calling program.
  
  
  
  Activate the Function Module: If the function module is not active, activate it. Sometimes, changes are made but not activated, leading to interface issues.
  
  
  Review Custom Code: If the function module is custom, review the code to ensure that it adheres to the expected interface. Update the function module if necessary.
  
  
  Check for Transport Issues: If the function module was transported, ensure that all related objects were transported correctly. You may need to re-transport the function module or related objects.
  
  
  Consult Documentation: Review any documentation related to the migration or upgrade process to ensure that all necessary steps were followed.
  
  
  Debugging: If the issue persists, consider debugging the calling program to see how it interacts with the function module and identify where the mismatch occurs.
  
  
  Related Information:
  
  SAP Notes: Check for any relevant SAP Notes that may address this specific error or provide guidance on similar issues.
  SAP Community: Engage with the SAP Community forums to see if other users have encountered and resolved similar issues.
  System Logs: Review system logs (transaction SLG1) for additional context or related errors that may provide more insight into the problem.
  
  By following these steps, you should be able to identify and resolve the issue related to the CNV_10020668 error message in SAP.