Soft state activation failed; could not load metadata of service '&1'

What causes this issue?

You tried to activate the service for the soft state processing mode but
the metadata could not be loaded

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?

Make sure that your service is defined correctly before activating the
soft state processing mode for your service. 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.