Acevedo-Rosas, R., & Cházaro Basáñez, M. de J. (2003). A new species and a nomenclatural change in Graptopetalum (Crassulaceae). Novon a journal of botanical nomenclature from the Missouri Botanical Garden, 13, 377-380. (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.
