How To Fix UPWB175 - Web interface &1 cannot be changed

SAP Error Message - Details

• Message type: E = Error

• Message class: UPWB - Messages for Development Class UPWB

• Message number: 175

• Message text: Web interface &1 cannot be changed

What causes this issue?

You want to open the Web interface for processing, or switch to the
processing mode. However, the Web Interface Builder automatically
switched into the display mode. Possible reasons for this are:
The Web interface is already being edited by another user.
The Web interface package does not allow any changes. The Web
interfaces delivered by SAP can be copied by the customers, but cannot
be modified later without a developer key being requested.
The system settings generally forbid changing workbench objects.

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?

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.