Diagnosis
TO copy a subtree in a hierarchy, the following conditions must be met:

• The node of the subtree to copy can only be copied to the same level of
the target material hierarchy. A prerequisite is that the higher-levelnode (parent node) of the node to copy must exist in the target materialhierarchy.

• The node of the subtree to copy cannot appear outside of the
corresponding subtree in the target hierarchy.

• The total path length of the subtree to copy and the target hierarchy
(from the node to copy to the root node) must not be deeper than 10levels.