How To Fix WFF_FORM_SERVER201 - IF_WFF_FORM_SERVER_OBJECT: Invalid Class (&)

SAP Error Message - Details

• Message type: E = Error

• Message class: WFF_FORM_SERVER - Web Financials Forms: Form Server

• Message number: 201

• Message text: IF_WFF_FORM_SERVER_OBJECT: Invalid Class (&)

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.

What else can you do?

First, use our AnswerBot below to get a possible cause and solution (requires a premium subscription).

Also, review the in-depth Common Questions & Answers listed below; you could discover a solution there or be able to connect with others who have faced similar challenges.

You can also try searching the SAP support portal (support.sap.com) but you need a special user ID to access it. It is possible that an SAP support note exists that provides additional details about the mistake or even steps for fixing it.

Smart SAP Assistant

• What is the cause and solution for SAP error message WFF_FORM_SERVER201 - IF_WFF_FORM_SERVER_OBJECT: Invalid Class (&) ?

  Certainly! Here's a detailed explanation for the SAP error message:
  
  SAP Error Message:
  WFF_FORM_SERVER201 IF_WFF_FORM_SERVER_OBJECT: Invalid Class (&)
  
  Cause:
  This error occurs in the SAP Workflow framework when the system tries to instantiate or reference a class that is either:
  
  Not existing in the system,
  Not active,
  Not properly implemented,
  Or the class name passed to the workflow container or method is incorrect or empty.
  
  The placeholder (&) in the message usually contains the name of the invalid or missing class.
  In particular, this error is raised by the interface IF_WFF_FORM_SERVER_OBJECT which is used in the context of workflow form processing or form server objects.
  
  When does it occur?
  
  When a workflow step tries to call a form server object (class) that is not available.
  When the class name is dynamically determined and the value is wrong or missing.
  When a custom workflow or form server object is incorrectly configured or not transported properly.
  During workflow execution involving form processing or form server calls.
  
  
  Solution:
  
  
  Check the Class Name:
  
  Verify the class name passed to the workflow step or form server object.
  Make sure the class name is correct, exists in the system, and is active.
  
  
  
  Activate the Class:
  
  Go to transaction SE24 (Class Builder).
  Enter the class name and check if it exists.
  If it exists but inactive, activate it.
  
  
  
  Check Workflow Configuration:
  
  Review the workflow step or container element that references the class.
  Ensure the class name is correctly maintained in the workflow container or method parameters.
  
  
  
  Check Transport and System Consistency:
  
  If the class was recently transported, ensure the transport was successful.
  Check for missing dependencies or incomplete transports.
  
  
  
  Debugging:
  
  Use transaction SWI1 or SWI2_DIAG to find the workflow instance causing the error.
  Debug the workflow to see what class name is being passed.
  Check the call stack in the debugger to identify where the invalid class is referenced.
  
  
  
  SAP Notes and Support:
  
  Search for SAP Notes related to WFF_FORM_SERVER201 for any known issues or patches.
  If the problem persists, consider raising a message with SAP Support including workflow logs and system details.
  
  
  
  
  Related Information:
  
  Interface: IF_WFF_FORM_SERVER_OBJECT is part of the SAP Workflow framework used for form server objects.
  Transaction Codes:
  
  SE24 - Class Builder (to check and activate classes)
  SWI1 - Work Item Selection (to find workflow instances)
  SWI2_DIAG - Workflow Diagnosis (to analyze workflow errors)
  
  
  Workflow Container: The container element that holds the class name must be correctly populated.
  SAP Help: Refer to SAP Workflow documentation for form server objects and class usage.
  
  
  Summary:
  The error WFF_FORM_SERVER201 IF_WFF_FORM_SERVER_OBJECT: Invalid Class (&) indicates that the workflow is trying to use a class that is invalid or missing. Verify the class name, activate the class if needed, and ensure the workflow configuration is correct to resolve the issue.
  
  If you provide the actual class name in the error message, I can help you with more specific guidance.