How To Fix FDT_CORE320 - Call to class &1 is illegal

SAP Error Message - Details

• Message type: E = Error

• Message class: FDT_CORE - Formula & Derivation Tool: Core

• Message number: 320

• Message text: Call to class &1 is illegal

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 FDT_CORE320 - Call to class &1 is illegal ?

  The SAP error message FDT_CORE320: Call to class &1 is illegal typically occurs in the context of SAP's Field Data Tool (FDT) or when working with custom classes in ABAP. This error indicates that there is an attempt to call a class that is either not defined, not accessible, or not properly instantiated.
  Causes:
  
  Class Not Found: The specified class does not exist in the system or is misspelled.
  Access Issues: The class may not be accessible due to visibility restrictions (e.g., it is declared as private or protected).
  Namespace Issues: The class might be in a different namespace that is not properly referenced.
  Incorrect Instantiation: The class might not be instantiated correctly, leading to an illegal call.
  Transport Issues: If the class was recently transported, it may not have been activated in the target system.
  
  Solutions:
  
  Check Class Existence: Verify that the class specified in the error message exists in the system. You can do this by