How To Fix SPXN128 - All external message types must belong to the same package

SPXN128 - Overview

• Message type: E = Error

• Message class: SPXN - Proxy Generation

• Message number: 128

• Message text: All external message types must belong to the same package

What causes this issue?

The assigned message types are based on an external WSDL description and
lie in different packages (&v1& and &v2&).

System Response

Object is inconsistent, because it may be impossible to generate a
unique schema description of the contract or contract implementation.

How to fix this error?

On the 'Objects' tab, all used message types and their packages are
displayed. Navigate to the message type and change the package via
menu->Goto->Object Directory Entry

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.

SPXN128 - Details

• The SAP error message SPXN128 indicates that there is an issue with the configuration of external message types in your SAP system. Specifically, this error occurs when the external message types defined in your system do not all belong to the same package. This is a requirement for certain configurations in SAP, particularly when dealing with external systems or interfaces.
  
  Cause:
  The primary cause of the SPXN128 error is that the external message types you are trying to use or configure are defined in different packages. In SAP, a package is a container for objects, and certain configurations require that all related objects (in this case, external message types) be grouped within the same package.
  
  Solution:
  To resolve the SPXN128 error, you can follow these steps:
  
  
  Identify the External Message Types: Determine which external message types are causing the issue. You can do this by checking the configuration settings where the error is being triggered.
  
  
  Check