DN/CN entry

hello experts

we recd d.note from our supplier for rate diff with gst. Yes debit note not Cr note. Also supplier shows in Gstr 2A in debit note col. Everything ok.

For my accounting i want to rise c-note. But tally accepts CN only for sales account. now i consider the supplier DN as purchase bill.

Pls anybody suggest how to account credit note entry for sundry crs account. Or anyother vr mode.???

Thanks..