Credit Note Received without GST

Mohanraj J (1166 Points)

17 November 2020  
Dear Friends,
We've received credit Note from our supplier towards 30% refund of Detention fee. In that credit Note there is no GST. We need to show this credit Note in GSTR 3B or not required? if it is mandatory to show in the 3B, if any impact due to No GST in the credit Note?..