Debit Memo

  To All,

I have a Scenario some one guide me what i do for this?

Scenario

PO of amount = 5000
PO Quantity= 5 kg

at inventory

Receive Quantity= 5 kg

After that the Supplier send the Invoice with
Quantity= 5.5 kg
Bill Amount = 5500

So, in this the supplier refuses to revised the wrong billing and asking to send him Debit Memo


Any one guide me how i deal this?

Regards
Farhaj Ahmed Khan