Wearable Dev Center, Getting error: Bundle ID must not contain "-"

[Ashray-Pai]

In the Wearable Dev Center,

a week back when I created my 1st App, I had the bundle identifier as "helloworld.Meta-Wearable-Test" and I did not get any error.

Now for my 2nd App with the bundle identifier "imin.Hello-Wearables-World" i am getting the error: Bundle ID must not contain "-"

Is this is bug or a requirement?

Screenshot from my 1st App:


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Screenshot from my 2nd App: