DEFTAX_ITEM entries refer to &1 clearing documents without lines.

What causes this issue?

In the source system, you cleared invoices with clearing documents
without line items. The initial load does <ZH>not</> transfer such kind
of clearing documents to the Central Finance system.

System Response

The deferred tax postprocessing report uses generic placeholders
instead of the missing clearing documents.

How to fix this error?

This message is for your information only.

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.