Selected and managed speed on approach - A320V2

[BoeingSpeedbird]

Using selected speed and flaps to initiate initial approach, then with gear down and selecting flap 3 I’ll then go back to managed speed to reduce workload (this is what I’ve seen in videos). However, flaps 3 and 4 don’t ever reduce speed to Vapp speed as shown in MCDU, so unless I go back to selected speed I’ll come in too fast. What am I doing wrong? Is this something to do with the timing of when you activate approach phase on the MCDU - if activate and then go selected (for flaps 1&2), can you then not get back into approach phase on MCDU to coordinate speeds and automatically manage speeds for flaps 3&4? 

[BenAura]

I had this problem too, the only (temporary) way I know to solve this is to turn off my autothrust, set the thrust to idle and set the speedbrakes. And I think it's better to use manual thrust for the approach.

[BoeingSpeedbird]

My solution (or this might be normal procedure?) is to not select the activate approach phase on MCDU if intending to use selected speeds through flaps 1-2. I suspect if you activate approach phase on MCDU before selecting ‘selected’ speeds through flaps 1-2 that the ‘selected’ speeds disarm the prior activation phase on MCDU, which you can’t reactivate later. So, what works is this: selected speeds and flaps 1-2; gear down; activate approach phase MCDU; then command speeds to follow flaps 3-full automatically.