Dickmann, D. I., & Kuzovkina, J. (2014). Poplars and willows of the world, with emphasis on silviculturally important species. In Poplars and willows: Trees for society and the environment (pp. 8-91). Wallingford UK: CABI. (Link)
Unintended disagreements occur when a parent (B) is
thinned by swapping a child (E) to another part of the
taxonomic tree, resulting in existing IDs of the parent being interpreted
as disagreements with existing IDs of the swapped child.
Identification
ID 2 of taxon E will be an unintended disagreement with ID 1 of taxon B after the taxon swap
If thinning a parent results in more than 10 unintended disagreements, you
should split the parent after swapping the child to replace existing IDs
of the parent (B) with IDs that don't disagree.