MD83FO is correct about the secondary - Seen it sequence too when flying downwind under vectors within 5nm of the FAT when its a straight copy of the primary F-PLN.
I have to say I do what safelife says on an ILS approach. On an rnav or managed non-precision approach where the approach is steeper than standard this technique could leave you below the level of the FAF. Not somewhere I want to be...