How to update dynamic attributes in Loyalty Management

Hello,

I want to update a dynamic attribute as a function of the same dynamic attribute (Total flights = Total flights + 1).

The issue I am facing is that dynamic attribute is not available in list of variables for selections while maintaining the function for the attribute:

As in the picture, I select the update attribute action and select the attribute and click on the formula to enter the formula. Now, under the list of variables, I need the same dynamic attribute for entering the valid formula.

Am I missing any configuration steps? Please help.

Thanks,

Vicky