How To Fix OL846 - Mandatory parameter '&' missing in method '&' of '&'

SAP Error Message - Details

• Message type: E = Error

• Message class: OL - Workflow object types: Run-time system

• Message number: 846

• Message text: Mandatory parameter '&' missing in method '&' of '&'

What causes this issue?

The method is inherited from a super type or interface type. The
parameter string of this method can only be extended by optional
parameters. However, a parameter defined in the original was deleted
from the parameter string.

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?

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message OL846 - Mandatory parameter '&' missing in method '&' of '&' ?

  The SAP error message OL846 indicates that a mandatory parameter is missing in a method call. This error typically occurs in the context of ABAP programming, particularly when working with function modules, methods, or classes. The message provides placeholders for the specific parameter, method, and class that are causing the issue.
  Cause:
  
  Missing Parameter: The most common cause of this error is that a required parameter has not been provided when calling a method or function module.
  Incorrect Method Signature: The method being called may have been defined with mandatory parameters that are not being supplied in the call.
  Changes in Method Definition: If the method's definition has changed (e.g., parameters were added or modified) and the calling code has not been updated accordingly, this error can occur.
  Dynamic Calls: If the method is being called dynamically (e.g., using CALL METHOD with a variable), it may not be passing the required parameters correctly.
  
  Solution:
  
  Check Method Signature: Review the method or function module definition to identify the mandatory parameters. Ensure that all required parameters are being passed in the call.
  Update Calling Code: Modify the code that calls the method to include the missing parameters. Ensure that the parameters are being passed in the correct order and with the correct data types.
  Debugging: Use the ABAP debugger to step through the code and inspect the parameters being passed to the method. This can help identify which parameter is missing.
  Documentation: Refer to the SAP documentation or the method's documentation to understand the expected parameters and their significance.
  Check for Changes: If the method has been recently modified, check the change logs or consult with the development team to understand what changes were made and how they affect the calling code.
  
  Related Information:
  
  ABAP Documentation: Review the official SAP ABAP documentation for guidelines on method and function module calls.
  SAP Notes: Search for relevant SAP Notes that may address specific issues related to the method or function module in question.
  Community Forums: Consider checking SAP Community forums or other developer forums for similar issues and solutions shared by other developers.
  
  By following these steps, you should be able to identify and resolve the cause of the OL846 error in your SAP environment.