How To Fix OL813 - Mandatory parameter '&' missing

SAP Error Message - Details

• Message type: E = Error

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

• Message number: 813

• Message text: Mandatory parameter '&' missing

Self-Explanatory Message

Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of messages in the SAP system have a message text, however this is frequently insufficient to comprehend or resolve the problem.

To make things easier, more detailed information is frequently added to describe the issue, how to fix it, and the necessary steps or configuration modifications.

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Smart SAP Assistant

• What is the cause and solution for SAP error message OL813 - Mandatory parameter '&' missing ?

  The SAP error message OL813, which states "Mandatory parameter '&' missing," typically occurs when a required parameter is not provided in a transaction or function module call. This error can arise in various contexts, such as during the execution of reports, transactions, or when calling function modules in ABAP programs.
  Cause:
  
  Missing Parameter: The most common cause is that a mandatory parameter, which is required for the execution of a function or transaction, has not been supplied.
  Incorrect Configuration: Sometimes, the configuration settings for a particular transaction or function module may not be set up correctly, leading to missing parameters.
  User Input: If the error occurs during user input, it may be due to the user not filling in all required fields in a screen or selection criteria.
  Custom Development: In custom ABAP programs, if a developer forgets to pass a required parameter to a function module or method, this error can occur.
  
  Solution:
  
  Check Required Parameters: Review the documentation for the transaction or function module to identify which parameters are mandatory. Ensure that all required parameters are being passed correctly.
  Input Validation: If the error occurs during user input, ensure that all mandatory fields are filled out before executing the transaction or report.
  Debugging: If you are a developer, use the ABAP debugger to trace the execution of the program and identify where the missing parameter is supposed to be set.
  Configuration Review: If the error is related to configuration, check the relevant settings in the SAP system to ensure that all necessary parameters are defined.
  Consult SAP Notes: Sometimes, specific issues may be documented in SAP Notes. Check the SAP Support Portal for any relevant notes that might address this error.
  
  Related Information:
  
  Transaction Codes: Depending on where the error occurs, you may want to look at specific transaction codes related to the function or report you are using.
  SAP Documentation: Refer to the official SAP documentation for the specific module or function you are working with to understand the parameters required.
  Community Forums: SAP Community and other forums can be helpful for finding similar issues faced by other users and the solutions they found.
  
  If you continue to experience issues after checking these areas, consider reaching out to your SAP support team or consulting with an SAP expert for further assistance.