RATIONALE
Merge two phone-related field on registration as they overlap. Having only
one is sufficient for contact-oriented model like registration.
SPECIFICATIONS
Registration model currently holds two phone field, phone and mobile. This
leads to having records with sometimes phone, sometimes mobile being filled.
This makes phone flows not easy: we have to define fallbacks (use phone or
mobile), data is not always synchronized, ... in the end what event users
need is one phone field to be able to communicate with attendees. Having
only one field is sufficient and simplifies the model.
Keep only one phone field, instead of two. Merge phone and mobile into a single
one, keeping phone as first value when having both available e.g. when
synchronizing with the partner.
Task-3366899
Part-of: odoo/odoo#128232
Co-authored-by: "Jeremy Hennecart" <jeh@odoo.com>
