How To Fix SWF_EXP_001171 - Unable to read result parameter '&1' of method '&2'

SAP Error Message - Details

• Message type: E = Error

• Message class: SWF_EXP_001 - Expression Service Messages

• Message number: 171

• Message text: Unable to read result parameter '&1' of method '&2'

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message SWF_EXP_001171 - Unable to read result parameter '&1' of method '&2' ?

  The SAP error message SWF_EXP_001171 indicates that there is an issue with reading a result parameter in a workflow. This error typically occurs in the context of SAP Business Workflow when the workflow engine is unable to retrieve the expected output from a method that was called during the workflow execution.
  Cause:
  
  Missing or Incorrect Parameter: The result parameter specified in the error message (&1) may not be defined correctly in the method (&2). This could be due to a typo, or the parameter may not exist in the method's definition.
  Method Execution Failure: The method might have failed to execute properly, leading to the absence of the expected result.
  Authorization Issues: The user executing the workflow may not have the necessary authorizations to access the method or its parameters.
  Data Type Mismatch: There could be a mismatch in the expected data type of the result parameter, causing the workflow to fail when trying to read it.
  Workflow Configuration Issues: The workflow might not be configured correctly, leading to issues in parameter mapping.
  
  Solution:
  
  Check Method Definition: Verify that the method being called in the workflow is correctly defined and that the result parameter exists. Ensure that the parameter names match exactly.
  Review Workflow Configuration: Check the workflow configuration to ensure that the method is correctly linked and that the parameters are mapped properly.
  Debugging: Use transaction SWI1 (Work Item Overview) or SWI2_FREQ (Workflow Monitoring) to analyze the workflow instance and check for any errors in the execution log.
  Authorization Check: Ensure that the user executing the workflow has the necessary authorizations to access the method and its parameters.
  Test Method Independently: Execute the method independently (e.g., in SE37 or SE80) to see if it works as expected and returns the correct result.
  Check for Data Type Issues: Ensure that the data types of the parameters are compatible and correctly defined in the method signature.
  
  Related Information:
  
  Transaction Codes: 
  
  SWI1: Work Item Overview
  SWI2_FREQ: Workflow Monitoring
  SE37: Function Module
  SE80: Object Navigator
  
  
  SAP Notes: Check for any relevant SAP Notes that might address known issues related to this error message.
  Documentation: Review SAP documentation on workflows and method calls for best practices and troubleshooting tips.
  
  If the issue persists after following these steps, consider reaching out to your SAP support team or consulting the SAP Community for further assistance.