GST DEBIT /CREDIT NOTE REPORTING QUERY

Ajnas (Student) (844 Points)

02 March 2021  
Situation 1.Mr. X sell the product Rs.150000+18% GST but actual rate pf GST 12% how to solve this issue?
Situation 2.Mr. X sell the product Rs.150000+12% GST but actual rate pf GST 18% how to solve this issue?
In situation 1. and 2. How to report this in GSTR 1 and GSTR 3B? in this case only change in tax amount not for taxable value? but gstr 1 how to report tax amount only?