Service '&1' does not support soft state mode.

What causes this issue?

You tried to activate the service for the soft state processing mode.

System Response

The SAP Gateway framework has detected that the service has not been
enabled for working in the soft state processing mode.

How to fix this error?

Check the note <ZH>https://service.sap.com/sap/support/notes/1986626</>
for prerequisites and further information on the soft state processing
mode.

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.