No information on delivery, status invalid

What causes this issue?

The message was processed successfully in the SAP system and transferred
to the connected system. However, it was not possible to get information
about the delivery to the recipient because the send status data that
was returned had errors or was incomplete. It is not possible to tell
from this data whether the message was delivered or not.


Technical Information
IF &V2& <> ''
&V2&
&V3&&V4&
ELSE
<No information available>
ENDIF

How to fix this error?

Error message extract from SAP system. Copyright SAP SE.