Explanation:
GST is preconfigured in Vision
In Sales Order, System populated the tax details from there relevent masters. Tax Chapter gets populated from Item Master for the selected item. Tax class gets populated from customer master, the customer selected in Sales order. Tax environment can be selected and it depends on site and customer can be defined site customer.
Note: Tax class, Tax Chapter and Tax environment should be first defined in Tax class master, Tax chapter and Tax environemnt masters respectively.- These have been pre-populated in Vision