How To Fix T5178 - Extension cannot be deleted because it is being used!

T5178 - Overview

• Message type: E = Error

• Message class: T5 - SAPphone: Messages for telephony

• Message number: 178

• Message text: Extension cannot be deleted because it is being used!

What causes this issue?

This telephone number is used in one or more number groups.

System Response

This telephone number can, therefore, not be deleted.

How to fix this error?

If you still want to delete this telephone number, you must firstly
remove it from all number groups.
You can display the telephone numbers used by the different number
groups by choosing Environment -> Deflect call -> Maintain groups ->
Display in the SAPphone system administration.

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 T5178 - Extension cannot be deleted because it is being used! ?

  The SAP error message T5178 indicates that an extension (such as a custom field or enhancement) cannot be deleted because it is currently in use. This typically occurs in the context of SAP's data dictionary or when working with custom developments in the system.
  
  Cause:
  
  Active Usage: The extension is actively being used in one or more applications, reports, or processes within the SAP system.
  Dependencies: There may be dependencies on the extension from other objects, such as programs, function modules, or other enhancements.
  Configuration: The extension might be part of a configuration that is currently active or in use.
  
  
  Solution:
  To resolve this error, you can follow these steps:
  
  
  Identify Usage:
  
  Use transaction codes like SE11 (Data Dictionary) or SE80 (Object Navigator) to check where the extension is being used.
  Look for references in custom programs, function modules, or other enhancements.
  
  
  
  Remove Dependencies:
  
  If the extension is being referenced in any custom code or configuration, you will need to remove