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

FKKINV055 - Overview

• 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.

FKKINV055 - Details

• 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