How To Fix OL620 - Object type '&' has no subtypes

SAP Error Message - Details

• Message type: E = Error

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

• Message number: 620

• Message text: Object type '&' has no subtypes

What causes this issue?

You wish to delegate all requests directed to one object type to
another object type. This is only possible if the second object type is
a subtype of the original object type.
However, in this case the original object type does not have any
subtypes and no delegation can therefore be specified.

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?

You should enter the object type to which requests are to be delegated
as a subtype of the original object type.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message OL620 - Object type '&' has no subtypes ?

  The SAP error message OL620, which states "Object type '&' has no subtypes," typically occurs when you are trying to create or manipulate an object type in the SAP system that does not have any defined subtypes. This can happen in various contexts, such as when working with object-oriented programming in ABAP or when dealing with certain configuration settings in the SAP system.
  Cause:
  
  Object Type Definition: The object type you are trying to use does not have any subtypes defined in the system. In SAP, object types can have subtypes that inherit properties and behaviors from the parent type.
  Incorrect Object Type: You may be referencing an object type that is not intended to have subtypes, or you may have made a typographical error in the object type name.
  Configuration Issues: There may be issues in the configuration of the object types in the system, leading to the absence of expected subtypes.
  
  Solution:
  
  Check Object Type Definition: Verify the definition of the object type in the SAP system. You can do this by navigating to the relevant transaction (e.g., SE11 for Data Dictionary) and checking if the object type has any subtypes defined.
  Create Subtypes: If the object type is supposed to have subtypes, you may need to create them. This can typically be done in the same area where the object type is defined.
  Correct Object Type Reference: Ensure that you are using the correct object type name in your code or configuration. Double-check for any typographical errors.
  Consult Documentation: Review the SAP documentation or help resources related to the specific object type you are working with to understand its intended use and subtype structure.
  Contact SAP Support: If you are unable to resolve the issue, consider reaching out to SAP support or your internal SAP team for assistance.
  
  Related Information:
  
  Object-Oriented Programming in ABAP: Understanding how object types and subtypes work in ABAP can help you avoid this error in the future.
  SAP Notes and Knowledge Base Articles: Search for SAP Notes related to OL620 for any specific patches or updates that may address this issue.
  Community Forums: Engage with SAP community forums or user groups where similar issues may have been discussed, and solutions shared.
  
  By following these steps, you should be able to identify the cause of the OL620 error and implement a suitable solution.