No session was created

What causes this issue?

The system did not create a session. The cause may be that no documents
exist or have to be processed in the specified interval. .

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?

INCLUDE NA_EINGABE_PRUEFEN

Error message extract from SAP system. Copyright SAP SE.