In Sales Quotation form, currently system does not calculate GST, if there is From and to date is specified in GST rate tax setup.

As per my discussion, Microsoft agent is suggesting that quotation does not have any date and hence this happens. I believe there shall at least be Quotation date (i.e., date on which quotation has been sent to a customer), so that the GST rates can be fetched fora particular date range from tax setup.

In GST, government can change the rates any time and to manage the GST rates for those all date ranges, it is essential that Microsoft considers this requirement and incorporate date in sales quotation, as well as considers the same in Tax configuration files update.