Cannot delete node

What causes this issue?

Node cannot be deleted because articles are assigned to the node.

System Response

The system cannot delete the selected node and its subnodes. Before you
delete a node, you have to make sure that no articles are assigned to a
node or its subnodes.

How to fix this error?

You should first remove all articles assignments made to the node and
its subnodes. You can then delete the main node with its subnodes.

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.