Why does TNM give a flat top berm warning when I enter in a non-zero berm top width value?

(Applies to TNM version 2.5 only) A new pop-up warning box is generated each time a user enters a non-zero top-width for berms, which warns against using flattop berms in TNM. This prohibits the user from modeling a flattop berm with the barrier/berm function. More.

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