deployment - "Untrusted App Developer" message when installing enterprise iOS Application

Question

I'm developing an enterprise application. When I was testing it in iOS8 beta I saw the following alert view:

Untrusted App Developer
Do you trust the developer "iPhone Distribution: ---" to run apps on you iPad?

It only appears the first time. Can I avoid it somehow? And what is it related to?

Answer 1

Today, I was testing this with iOS 9 Beta and found the solution.

To solve it, go to:

1. Settings -> General -> Profiles [Device Management on iOS 10]
2. Under ENTERPRISE APP, choose your current developer account name.
3. Tap Trust "Your developer account name"
4. Tap "Trust" in pop up.
5. Done