GST related query

1.Financial credit note is issued only for taxable value portion not for GST portion
In that case but while accounting in the books of supplier one doubt clarify me
For example There is a credit sale Rs.300000+ GST 10% (Rs.30000), but supplier issued financial credit note for Rs. 300000 but trade receivable as on such date Rs.330000 sale return acccounted in te book Rs.300000 but remaining Rs.30000
What to do this is still in balance sheet as trade receivable what to this gst portion in trade receivable , it is treated as discount allowed?
2. Financial credit note is issued only for taxable value portion not for GST portion
In that case but while accounting in the books of receipent one doubt clarify me
For example There is a credit purchase Rs.300000+ GST 10% (Rs.30000), but supplier issued financial credit note for Rs. 300000 but trade payable as on such date Rs.330000 purchase return acccounted in the book Rs.300000 but remaining Rs.30000
What to do this is still in balance sheet as trade receivable what to this gst portion in trade receivable , it is treated as discount received?