How To Fix FDT_EXPRESSIONS812 - No valid class: class &1 doesn't exist

SAP Error Message - Details

• Message type: E = Error

• Message class: FDT_EXPRESSIONS - Formula & Derivation Tool: Expressions

• Message number: 812

• Message text: No valid class: class &1 doesn't exist

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 FDT_EXPRESSIONS812 - No valid class: class &1 doesn't exist ?

  The SAP error message FDT_EXPRESSIONS812 indicates that there is an issue with a class that is expected to be present in the system but is not found. This error typically occurs in the context of SAP's Flexible Data Import (FDI) or when working with expressions in the context of data transformation or data mapping.
  Cause:
  
  
  Missing Class: The specified class (denoted by &1 in the error message) does not exist in the system. This could be due to:
  
  The class was never created or imported.
  The class was deleted or is not active.
  There is a typo in the class name or it is incorrectly referenced in the configuration.
  
  
  
  Transport Issues: If the class was recently transported from another system, the transport may not have included the class or it may not have been imported correctly.
  
  
  Namespace Issues: The class might exist in a different namespace that is not accessible in the current context.
  
  
  Solution:
  
  
  Check Class Existence:
  
  Use transaction code SE24 (Class Builder) to check if the class exists in the system. Enter the class name and see if it is available.
  If the class does not exist, you may need to create it or import it from another system.
  
  
  
  Correct References:
  
  Verify the configuration or code where the class is referenced. Ensure that the class name is spelled correctly and that it is being called in the right context.
  
  
  
  Transport Check:
  
  If the class was supposed to be transported, check the transport logs to ensure that the transport was successful and that the class was included.
  
  
  
  Namespace Verification:
  
  Ensure that the class is in the correct namespace and that your current user has the necessary authorizations to access it.
  
  
  
  Rebuild or Activate:
  
  If the class exists but is inactive, you may need to activate it. In SE24, you can activate the class if it is in a non-active state.
  
  
  
  Consult Documentation:
  
  If the class is part of a standard SAP package or solution, consult the relevant SAP documentation or support notes for additional guidance.
  
  
  
  Related Information:
  
  
  Transaction Codes:
  
  SE24: Class Builder
  SE80: Object Navigator (to check for related objects)
  SE11: Data Dictionary (to check for related database objects)
  
  
  
  SAP Notes: Search for relevant SAP Notes in the SAP Support Portal that may address known issues related to this error.
  
  
  Debugging: If you have access to debugging tools, you can set breakpoints to trace where the error is being triggered in the code.
  
  
  By following these steps, you should be able to identify the cause of the error and implement a solution to resolve it.