How To Fix 5W121 - Warning: prefix number &1 is in the partner namespace

5W121 - Overview

• Message type: E = Error

• Message class: 5W - Messages for PD (Particularly Workflow)

• Message number: 121

• Message text: Warning: prefix number &1 is in the partner namespace

What causes this issue?

Prefix numbers 800 through 899 are reserved for the developments of SAP
partners. Do not create objects within this range, as they could be
overwritten by objects created by SAP partners.

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?

Please choose a different prefix number.

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.

5W121 - Details

• The SAP error message 5W121 with the warning "prefix number &1 is in the partner namespace" typically relates to issues with XML namespaces in the context of SAP PI/PO (Process Integration/Process Orchestration) or when dealing with web services.
  
  Cause:
  This warning indicates that the prefix number specified in your XML message is being used in a namespace that is not recognized or is conflicting with another namespace. In XML, namespaces are used to avoid naming conflicts by qualifying names with a URI. The warning suggests that the prefix you are using is already defined in a partner namespace, which can lead to ambiguity in the interpretation of the XML document.
  
  Solution:
  To resolve this warning, you can take the following steps:
  
  
  Check Namespace Definitions: Review the XML message and ensure that the namespace prefixes are correctly defined. Make sure that the prefix you are using is not already defined in the partner's namespace.
  
  
  Modify Prefixes: If