How To Fix WD804 - Evaluate rule with function '&1' and path '&2'

SAP Error Message - Details

• Message type: E = Error

• Message class: WD - Workflow definition

• Message number: 804

• Message text: Evaluate rule with function '&1' and path '&2'

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message WD804 - Evaluate rule with function '&1' and path '&2' ?

  Certainly! Here's a detailed explanation for the SAP error message:
  
  SAP Error Message:
  WD804 Evaluate rule with function '&1' and path '&2'
  
  Cause:
  This error occurs in the Web Dynpro ABAP framework when the system tries to evaluate a rule (usually in a context mapping or UI element property) using a function module or method identified by &1 and a path &2, but the evaluation fails. The placeholders &1 and &2 are replaced at runtime with the actual function name and path.
  Common causes include:
  
  The function or method specified in the rule does not exist or is not accessible.
  The path provided is incorrect or does not point to a valid context node or attribute.
  The rule logic contains syntax errors or invalid expressions.
  Missing or incorrect import/export parameters in the function.
  The context node or attribute referenced is not yet instantiated or is null.
  Authorization or runtime errors during the function execution.
  
  
  Solution:
  To resolve this error, follow these steps:
  
  
  Check the Function/Method Name (&1):  
  
  Verify that the function or method used in the rule exists and is correctly spelled.
  Ensure that the function is active and properly implemented.
  If it is a custom function, check for syntax errors or runtime exceptions.
  
  
  
  Verify the Path (&2):  
  
  Confirm that the path points to a valid context node or attribute in the Web Dynpro component.
  Use the Web Dynpro Explorer or debugger to inspect the context structure at runtime.
  Make sure the context node/attribute is instantiated before the rule evaluation.
  
  
  
  Check Rule Syntax and Logic:  
  
  Open the rule in the Web Dynpro component and review the expression or condition.
  Correct any syntax errors or invalid references.
  Simplify complex expressions to isolate the problem.
  
  
  
  Debug the Rule Evaluation:  
  
  Set breakpoints in the function module or method used in the rule.
  Use the Web Dynpro debugger to step through the rule evaluation.
  Check for exceptions or unexpected values.
  
  
  
  Check Authorizations:  
  
  Ensure the user executing the Web Dynpro application has the necessary authorizations to execute the function or access the data.
  
  
  
  Review Transport and Activation:  
  
  If the function or rule was recently changed, ensure it is properly transported and activated in the target system.
  
  
  
  
  Related Information:
  
  SAP Note: Check for any SAP Notes related to WD804 or Web Dynpro rule evaluation errors.
  Web Dynpro Documentation:  
  
  SAP Help Portal - Web Dynpro ABAP  
  Look for sections on context mapping, rules, and expressions.
  
  
  Debugging Web Dynpro Applications:  
  
  Use transaction SE80 or WD_DDIC to inspect components.
  Use the Web Dynpro debugger to analyze runtime behavior.
  
  
  Common SAP Forums and Communities:  
  
  SAP Community (https://community.sap.com) for similar issues and solutions.
  
  
  
  
  If you provide the actual function name and path from the error message, I can help you analyze the specific case further.