How To Fix OL400 - Function module &1 has references to data types that are not supported

SAP Error Message - Details

• Message type: E = Error

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

• Message number: 400

• Message text: Function module &1 has references to data types that are not supported

What causes this issue?

The insert wizard for function modules does not support all types of
function module parameter. The following are not supported:
Parameters with generic types (for example TYPE C)
Parameters with the type TYPE

System Response

You can continue creating, but you will have to revise the method after
insertion.

How to fix this error?

The best way to proceed is as follows:
Continue the insertion of the method. When transferring parameters,
make a note of those to which you have not assigned a type.
Do not generate any implementation for the method, because this will
not usually be correct.
Revise the parameter types after the method has been inserted.
Now generate the implementation of the method by positioning the cursor
on the method and choosing the button 'Program'.

Procedure for System Administrators

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

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message OL400 - Function module &1 has references to data types that are not supported ?

  The SAP error message OL400 indicates that a function module is referencing data types that are not supported. This typically occurs when there are issues with the data types used in the function module, such as unsupported structures, tables, or fields.
  Causes:
  
  Unsupported Data Types: The function module may be using data types that are not compatible with the current version of SAP or the specific context in which it is being executed.
  Custom Data Types: If the function module references custom data types or structures that are not properly defined or are incompatible, this error can occur.
  Changes in Data Dictionary: If there have been recent changes in the data dictionary (like changes to structures or tables), it may lead to inconsistencies.
  Transport Issues: If the function module was transported from one system to another, there may be missing dependencies or data types that are not available in the target system.
  
  Solutions:
  
  Check Data Types: Review the function module and check all the data types it references. Ensure that all data types are supported and correctly defined in the system.
  Update Function Module: If the function module is using outdated or deprecated data types, consider updating it to use supported types.
  Recreate Custom Types: If custom data types are causing the issue, ensure they are correctly defined in the data dictionary and are available in the system.
  Transport Dependencies: If the function module was transported, ensure that all dependent objects (like data types, structures, etc.) are also transported and available in the target system.
  Check for Notes: Look for SAP Notes related to the specific function module or data types being used. SAP may have provided fixes or workarounds for known issues.
  Debugging: If you have access to debugging tools, you can debug the function module to identify the exact point of failure and the specific data types causing the issue.
  
  Related Information:
  
  SAP Documentation: Refer to the official SAP documentation for guidelines on supported data types and best practices for defining function modules.
  SAP Community: Engage with the SAP Community forums to see if others have encountered similar issues and what solutions they found effective.
  SAP Notes: Use the SAP Support Portal to search for relevant SAP Notes that may address this specific error message or provide additional context.
  
  By following these steps, you should be able to identify the cause of the OL400 error and implement a suitable solution.