GST is calculated based on the GST rate for the item. The default GST rate is fetched from the item master but can be adjusted to another available value in the GST master. The bifurcation of CGST, SGST, and IGST is determined as follows:
CGST/SGST is used when both the vendor's state and the bill-to location are the same.
IGST is applied when the states of the vendor and the bill-to location are different.
This ensures accurate GST calculation based on the location and item-specific rates.