How To Fix SO2_API020 - XSRF protection is activated for &1, but no BSP is marked as Start BSP

SAP Error Message - Details

• Message type: E = Error

• Message class: SO2_API - O2: Error Messages for Object Check

• Message number: 020

• Message text: XSRF protection is activated for &1, but no BSP is marked as Start BSP

What causes this issue?

The XSRF protection is activated for the BSP application "&V1&" (see
checkbox "XSRF Protection" on the "Properties" tab in the Web
Application Builder for the BSP application).
However, the "Start BSP" indicator is not set for any "Page with Flow
Logic" or any "Controller" (checkbox "Start BSP" on the "Properties" tab
in the Web Application Builder for "Page with Flow Logic" or
"Controller").

System Response

Therefore, the application cannot be started with any Page/Controller.

How to fix this error?

If you want to start the application with a Page/Controller, set the
"Start BSP" indicator for it.
Refer to the documentation on the "XSRF Protection" indicator.

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.