Mapping is only possible if father of &1 is the root node of the context

What causes this issue?

You want to define mapping for the &V1& attribute. The parent node of
&V1& is a node that is not the root node of the context. The parent node
of the attribute that you wish to assign as original is, however, the
root node of its context.

System Response

The system rejects the mapping function.

How to fix this error?

Mapping is only possible if either both parents are root nodes or both
parent nodes are not root nodes.
Mapping is not possible particularly when only one of the two parent
nodes is a root node.

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.