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Th if itme in cart trigger uses the items ID value. It is used to check if an particular Item is in the cart.
the code:
if (true && (($this->InCart("Taxable") == True))) {
will only work if you set the ID for an Item to "Taxable".
I have been able to reproduce the problem you are reporting on the tax tab where the colomns are not showing correctly.
I am starting a support ticket for you so we can look into this issue further.
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