How To Fix RMSL_WUI021 - Interface parameter *_OLD is missing

SAP Error Message - Details

• Message type: E = Error

• Message class: RMSL_WUI - Labeling Web UI: RMSL Class Messages Converted for Web UI

• Message number: 021

• Message text: Interface parameter *_OLD is missing

What causes this issue?

An interface parameter *_NEW contains an entry that is marked with 'U'
for UPDATE in the LINEMODE field. You need the original form of this
table row in *_OLD to be able to create a change document item for the
other fields.

System Response

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

How to fix this error?

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 RMSL_WUI021 - Interface parameter *_OLD is missing ?

  The SAP error message RMSL_WUI021, which indicates that the interface parameter *_OLD is missing, typically arises in the context of the SAP Retail Management System (RMS) or similar modules where data interfaces are involved. This error suggests that a required parameter for a specific function or interface is not being passed correctly.
  Cause:
  
  Missing Parameter: The error usually occurs when a required parameter (in this case, *_OLD) is not provided in the function call or interface.
  Configuration Issues: There may be issues with the configuration of the interface or the data model that leads to the absence of the expected parameter.
  Custom Development: If there are custom developments or enhancements in the system, they might not be correctly handling the parameters.
  Data Integrity Issues: If the data being processed is incomplete or corrupted, it may lead to missing parameters.
  
  Solution:
  
  Check Interface Definition: Review the interface definition to ensure that all required parameters, including *_OLD, are correctly defined and being passed.
  Debugging: Use the SAP debugger to trace the execution of the program or function module that is generating the error. This can help identify where the parameter is being lost or not set.
  Review Custom Code: If there are any custom developments, review the code to ensure that it correctly handles the parameters and does not omit any required ones.
  Configuration Review: Check the configuration settings related to the interface in question. Ensure that all necessary settings are in place and correctly configured.
  Data Validation: Validate the data being processed to ensure that it is complete and meets the expected format and requirements.
  SAP Notes: Search for relevant SAP Notes or Knowledge Base Articles (KBAs) that may address this specific error. SAP frequently updates its documentation and may have provided solutions or patches for known issues.
  
  Related Information:
  
  SAP Documentation: Refer to the official SAP documentation for the specific module you are working with, as it may provide insights into the parameters and their expected values.
  SAP Community: Engage with the SAP Community forums where other users may have encountered similar issues and can share their solutions.
  Transaction Codes: Familiarize yourself with relevant transaction codes (like SE80 for Object Navigator, SE37 for Function Modules, etc.) that can help you investigate the issue further.
  
  If the problem persists after trying the above solutions, consider reaching out to SAP support for more specialized assistance.