Goods return after MIRO

Dear Members,

I have an issue over the following scenario.

PO - 10 Units * 100/- per unit + 1000/-

MiGO - 10*100 = 1000/-

Excise Invoive capturing on 1000/- i.e 800.801.60+4 (vat) total = 86.40/-

MIRO - 10*100= 1000

Now 2 Units have been found as to be returned as quality not met.

So this is the scenario.

pls guide me how to do so for only 2 units.

regards,

shashi kanth.