Purchase return through invoice or challan

This query is : Resolved

Mukesh (Querist)
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23 January 2018 Good Day
We have received the product in a manufacturing company ( Machinery Parts), with the invoice mentioning for replacement , now the previous parts we are returning and the replacement parts taken.
Now the previously received parts is to be returned vide generating invoice or only challan ( not for sale).
Where as the replaced parts invoice not entered for accounting reason the full set machine already included the parts value.
what will be the correct procedure only challan will work for replacement ( No Cr. / Dr. note required).

Thanks
Mukesh