Use standard pattern watching 'elfin.Id' to load linked owner (IMMEUBLE
PARTENAIRE.PRORIETAIRE ACTOR) instead of listening to
HB_EVENTS.ELFIN_LOADED event. This is simpler, more reliable and limited
to the current elfin we are interested to. Indeed HB_EVENTS.ELFIN_LOADED
event is performed at rootscope.
First introduced owner management for TRANSACTION in addition to SAI.
Indeed some IMMEUBLE are not unique for a given SAI but only for the
pair: SAI and OWNER (=> elfin.PARTENAIRE.PRORIETAIRE.Id/ID_G).