How To Fix WUF018 - Specify a structure

SAP Error Message - Details

• Message type: E = Error

• Message class: WUF -

• Message number: 018

• Message text: Specify a structure

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.

Unfortunately, there isn't any extra information in this error notice.

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Smart SAP Assistant

• What is the cause and solution for SAP error message WUF018 - Specify a structure ?

  The SAP error message WUF018 ("Specify a structure") typically occurs in the context of SAP's Workflow functionality. This error indicates that a required structure has not been specified in a workflow definition or configuration. Here’s a breakdown of the cause, potential solutions, and related information:
  Cause:
  
  Missing Structure Definition: The workflow is expecting a specific structure to be defined, but it has not been provided.
  Incorrect Workflow Configuration: The workflow might be incorrectly configured, leading to the system not being able to identify the necessary structure.
  Data Type Issues: The data type expected by the workflow might not match the data being passed, leading to confusion in structure identification.
  
  Solution:
  
  
  Check Workflow Configuration:
  
  Go to the workflow definition in the SAP system and ensure that all required structures are correctly defined.
  Verify that the workflow is correctly linked to the necessary business objects and that all parameters are set.
  
  
  
  Define the Required Structure:
  
  If a specific structure is required, you may need to create or define it in the system. This can be done through transaction codes like SE11 (Data Dictionary) to create or modify structures.
  
  
  
  Review Workflow Steps:
  
  Check the steps in the workflow to ensure that they are correctly referencing the required structures. Look for any missing or incorrectly configured steps.
  
  
  
  Debugging:
  
  If the issue persists, consider using the workflow debugging tools available in SAP to trace the execution and identify where the structure is not being specified.
  
  
  
  Consult Documentation:
  
  Review SAP documentation or help resources related to workflows to ensure that you are following the correct procedures for defining and using structures.
  
  
  
  Seek Help from SAP Support:
  
  If you are unable to resolve the issue, consider reaching out to SAP support or consulting with an SAP expert who can provide guidance based on your specific configuration and requirements.
  
  
  
  Related Information:
  
  Transaction Codes: Familiarize yourself with relevant transaction codes such as SWDD (Workflow Builder), SWI1 (Work Item Selection), and SWI2_FREQ (Work Item Selection for Repeated Execution).
  SAP Notes: Check for any SAP Notes related to the specific version of SAP you are using, as there may be known issues or patches that address this error.
  Community Forums: Engage with SAP community forums or user groups where similar issues may have been discussed, and solutions shared.
  
  By following these steps, you should be able to identify the cause of the WUF018 error and implement a solution to resolve it.