Node ID &1 does not exist but it is used as NEXT or CHILD

What causes this issue?

A Next ID or Child ID with the value '&V1&' is used, for which there is
no node with a corresponding node ID.

System Response

Processing is terminated.

How to fix this error?

Check the extracted data or the transformation and correct the Child ID
or Next ID with the value '&V1&' or add a node with this ID so that the
hierarchy is consistent.

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.