Sales return paper heading purchase return or tax invoice

Post GST, we are receiving sales return claim paper (Expiry / Saleable) from the stockiest with heading printed “ Purchase Return” / “Debit Note” with CGST & SGST applied. Could any one please help me out by advising that it is acceptable  or only “Tax Invoice” heading shoule be printed on claim paper (Expiry / Saleable) in GST regime.