How To Fix FKKINV055 - Formal error: Change mode &1 not supported in function module &2

SAP Error Message - Details

• Message type: E = Error

• Message class: FKKINV - Invoicing in Contract Accounts Receivable and Payable

• Message number: 055

• Message text: Formal error: Change mode &1 not supported in function module &2

What causes this issue?

Internal program error: The function module specified was called in
change mode (Parameter <LS>I_UPDATE_MODE</>) that it does not support.

System Response

The system cannot perform the change.

How to fix this error?

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message FKKINV055 - Formal error: Change mode &1 not supported in function module &2 ?

  The SAP error message FKKINV055 indicates that there is an issue with the change mode being used in a specific function module related to the billing or invoicing process in the SAP Convergent Charging or Contract Accounts Receivable and Payable (FI-CA) module. The error message typically arises when an attempt is made to change an invoice or billing document in a way that is not supported by the function module being called.
  Cause:
  
  Unsupported Change Mode: The change mode specified (e.g., 'I' for insert, 'U' for update, 'D' for delete) is not supported by the function module being executed. This can happen if the function module is designed only for certain operations and the current operation does not match.
  Incorrect Function Module: The function module being called may not be the correct one for the intended operation, leading to a mismatch in expected behavior.
  Configuration Issues: There may be configuration settings in the system that restrict certain operations or change modes for specific document types.
  
  Solution:
  
  Check Change Mode: Review the change mode being passed to the function module. Ensure that it is appropriate for the operation you are trying to perform. Refer to the documentation for the specific function module to understand the supported change modes.
  Use Correct Function Module: Verify that you are using the correct function module for the operation you intend to perform. If necessary, consult with your SAP technical team or refer to SAP documentation to identify the appropriate function module.
  Review Custom Code: If this error arises from custom ABAP code, review the logic to ensure that the correct parameters and change modes are being used.
  Consult SAP Notes: Check for any relevant SAP Notes that may address this specific error or provide guidance on how to handle it. SAP Notes can provide patches or workarounds for known issues.
  Testing: If changes are made, conduct thorough testing to ensure that the issue is resolved and that the system behaves as expected.
  
  Related Information:
  
  Function Module Documentation: Look up the specific function module mentioned in the error message to understand its parameters and supported operations.
  SAP Community: Engage with the SAP Community forums to see if other users have encountered similar issues and what solutions they have found.
  SAP Support: If the issue persists and cannot be resolved through the above steps, consider reaching out to SAP Support for assistance.
  
  By following these steps, you should be able to identify the root cause of the error and implement a suitable solution.