Can not apply payload for Access Point Name configuration

Hello to all.

I am having troubles to have an "Advanced" payload applied to our fleet of iPads (iOS 6.1.3). The payload should set the

APN (Access Point Name) of our mobile broadband network but the configuration is not getting on the mobile devices. All

the iPads still have the "APN" field not configured (it's blank).

iPads are both iPad3,3 and iPad3,6 (based on LANDesk inventory)

iOS is 6.1.3 for all of them

LANDesk Core Server is 9.50.0.530

MDM is 9.0.4

Thanks to everybody in the Community!

Lorenzo C.