Gtol, I can't add 2 Gtol on one datum

I have 2 reference planes on my product.

Each plane has a flatness demand of 0.1 mm and to each other these planes need to be parallel within 0.2 mm.

I can add only one Gtol to a datum.

If I try to add the second Gtol, the first one is replaced.

How can I add 2 Gtol on one datum as in below picture?

Now the second Gtol is added on the drawing as a free note.

We are using Creo 2.0

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