  The purpose of the present note is twofold. Firstly, we highlight the
similarities between the ontologies of Kastner's possibilist transactional
interpretation (PTI) of quantum mechanics - an extension of Cramer's
transactional interpretation - and the authors' hidden-measurement
interpretation (HMI). Secondly, we observe that although a weighted symmetry
breaking (WSB) process was proposed in the PTI, to explain the actualization of
incipient transactions, no specific mechanism was actually provided to explain
why the weights of such symmetry breaking are precisely those given by the Born
rule. In other terms, PTI, similarly to decoherence theory, doesn't explain a
quantum measurement in a complete way, but just the transition from a pure
state to a fully reduced density matrix state. On the other hand, the recently
derived extended Bloch representation (EBR) - a specific implementation the HMI
- precisely provides such missing piece of explanation, i.e., a qualitative
description of the WSB as a process of actualization of hidden
measurement-interactions and, more importantly, a quantitative prediction of
the values of the associated weights that is compatible with the Born rule of
probabilistic assignment. Therefore, from the PTI viewpoint, the EBR provide
the missing link for a complete description of a quantum measurement. However,
EBR is in a sense more general than PTI, as it does not rely on the specific
notion of transaction, and therefore remains compatible with other physical
mechanisms that could be at the origin of the measurement-interactions.
