GST related query

Ajnas (Student) (844 Points)

26 November 2020  
Mr. Y sell the goods to Mr. X on credit Rs.300000+18% GST, Mr. X is already taken input on such purchase, later mr. Y issued commercial credit note(cash discount) to Mr. X for full amount including GST (Rs.354000), in this case receipent is required to reverse the itc? Supplier is required to pay the output tax if the credit note beneifit is taken in GST return?
Financial credit note issued for only taxable value or invoice value( including GST)?
1.That means financial credit note issued only for taxable value portion not for GST portion?
2.in this case if the supplier is allowed cash discount (commercial credit note) including GST portion, receipent is received cash discount for full value ( including GST portion ie, Taxable value300000+54000GST), receipent is required to reverse the ITC? As per 37(1) of GST Act,already says that discount received can considered as payment, then discount received for GST portion is also considered as payment?