How To Fix 5W122 - Prefix number &1 is in the customer namespace

5W122 - Overview

• Message type: E = Error

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

• Message number: 122

• Message text: Prefix number &1 is in the customer namespace

What causes this issue?

Prefix numbers 900 through 999 are reserved for customers. For this
reason, such entries must not be created in an SAP system.

System Response

The entry cannot be created.

How to fix this error?

Choose a different prefix number.

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.

5W122 - Details

• The SAP error message 5W122 indicates that a prefix number (in this case, &1) is in the customer namespace. This typically occurs when you are trying to create or modify an object (like a function module, class, or table) that uses a prefix reserved for customer-specific developments, but the prefix is not correctly defined or is conflicting with existing objects.
  
  Cause:
  
  Namespace Conflict: The prefix you are trying to use is already defined in the customer namespace, which is reserved for customer-specific developments.
  Incorrect Prefix Usage: You may be using a prefix that is not allowed or is already in use by another object in the system.
  Development Class Issues: The development class you are using may not be correctly set up to allow the use of certain prefixes.
  
  
  Solution:
  
  Check Prefix Usage: Verify the prefix you are trying to use. Ensure that it is not already in use by another object in the customer namespace.
  Change