purchase return

You ll raise Debit Note for Purchase Return and Send the material to your supplier. After he received then he will show the details in his GSTR 1. You ll less the value in Your GSTR 3B return... 

At the time / month of Goods return with Your debit note You will less the Debit note value (tax) In Your April month ITC...

If You don't have any inwards in April then You ll be add the Debit note Tax value in Your Outward supplies value...

No need to wait supplier upload his credit note in their GSTR 1 return...

no I am asking whether purchase return ITC has to be shown in ITC reversal or shown under all other itc after netting of purchase

reverse the itc in next month 

i.e. I have to shown in ITC reversal