* Handle new GST effective rate on 1st June 2018

   - Retrieve hold sales before 1st June 2018 system will reset the GST rate and GST Code and recalculate the item and bill amount when retrieve or pay the bill.

   - Refund bill before 1st June 2018 will remain the item and service charge GST rate

   - System will auto use the new effective GST rate when business date start from 1st June 2018