The BAPI does not support packet processing in the current release

What causes this issue?

In this release the BAPI cannot process packets, it can only process
single IDocs.

System Response

The BAPI-IDoc cannot be processed further.

How to fix this error?

Change the process code in inbound processing for the partner system
&v1& under message type &v2& in the <DS:TRAN.WE20>partner profile</>.

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.