For replacement material have to generate Ewaybill

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27 June 2023 we purchased materials with a warranty, but now the material is sending for replacement purposes the value of the material is above 50000/-, and also the invoice is 1 year old, so in this case we cannot give a Debit note as a purchase return, so there are asking for our sales invoice and they provide there sales invoice(for us purchase invoice) to nullify it.
We have sent it through DC and generated E-waybill on it and asked them to send replacement material on DC itself. Is this correct, if not please let me know what to do in those cases? and also let me if we have to generate E-waybill for replacement goods on a returnable basis.