Print to invoice_items.php rules

[Sailorjohn_98]

I would like my invoice to print the rule in % that has been set
For example for a specific group i've set for that product that its rule in the final price is 44% (DATax with math operation -%)
i would like that 44% to appear in that form

what should i add in invoice_items.php so it can print it?


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