How To Fix OL403 - Data type & cannot be used for methods

OL403 - Overview

• Message type: E = Error

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

• Message number: 403

• Message text: Data type & cannot be used for methods

What causes this issue?

You tried to create a method in the BOR with a data type that is not
supported. In the BOR, only flat structures or fields of flat structures
are allowed as reference types for parameters.

System Response

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

How to fix this error?

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message OL403 - Data type & cannot be used for methods ?

  The SAP error message OL403 ("Data type & cannot be used for methods") typically occurs when you are trying to use a data type in a method that is not compatible or not allowed. This can happen in various contexts, such as when defining methods in classes or interfaces in ABAP (Advanced Business Application Programming).
  
  Cause:
  
  Incompatible Data Type: The data type you are trying to use for a method parameter or return type is not valid. This can happen if you are using a complex data type (like a table or structure) that is not allowed in the context of method parameters or return types.
  Non-Reference Types: If you are trying to use a non-reference type (like a standard data type or a structure) in a context that requires a reference type (like a class or interface).
  Incorrect Method Signature: The method signature may not match the expected types defined in the interface