Problem Sync add interfaces in Zones FortiManager > FortiGate

[helpmyfortinet]

Setup:

FortiManager (FortiOS 5.2.4) + FortiGate 1500D (FortiOS 5.2.4)

Using VDOM's

Problem:

I tried to create a zone within FortiManager, but no luck with that (there is no option within the interfaces).

I unmanaged the FortiGate and created the Zones on the FortiGate. After that I let it Managed again on the FortiManager and I see the Zones at the interfaces on the FortiManager.

Now I add interfaces (Vlan's) to the Zones (on the FortiManager). Push on Install > Install Device Settings (only) > I do not see the device and VDOM where I made the change! Means I cannot push my setting to the FortiGate.

I unmanaged the FortiGate from the FortiManager. I added the interfaces (Vlan's) to the Zones on the FortiGate. Put the FortiGate to manage by the FortiManager.

I don't see the interfaces in the Zones, I did put on the FortiGate,  at the FortiManager. The Zones stay's empty

Do I something wrong?