How To Fix OL304 - ABAP type '&' is not defined

OL304 - Overview

• Message type: E = Error

• Message class: OL - Workflow object types: Run-time system

• Message number: 304

• Message text: ABAP type '&' is not defined

What causes this issue?

Internal program error:
The function module 'SWC_CONT_EDIT_DEF' was called by another component
incorrectly parameterized.

How to fix this error?

Please report this error to SAP.

Error message extract from SAP system. Copyright SAP SE.

OL304 - Details

• The SAP error message OL304, which states "ABAP type '&' is not defined," typically occurs when the ABAP program or function module is trying to reference a data type that has not been defined or is not recognized in the current context. This can happen for several reasons, including:
  Causes:
  
  Typographical Error: There may be a typo in the type name being referenced.
  Missing Type Definition: The type may not have been defined in the program or included from another program or include file.
  Scope Issues: The type might be defined in a different scope (e.g., within a class or function module) and is not accessible in the current context.
  Inconsistent Naming: The type might have been renamed or deleted in the ABAP Dictionary.
  Namespace Issues: If you are using a custom type, it may not be in the correct namespace or may not be activated.
  
  Solutions:
  
  Check for Typos: Review the code for any spelling mistakes in