reversal of J1iex

HI,

I have problem regarding reversal of J1iex , I want to reverse the excise posted by J1iex

.can anybody tell me how to reverse or cancel the posted excise invoice by j1iex.

I explain wht the process we follow in Purchase of rawmaterail

1. create PO

2. capture excise invoice by J1iex (update part 1 register)

3. Migo to receive material

4. post the excise by j1iex (update rg23 part 2 register).

Now the problem is that we want to reverse the whole process .

PLz reply its urgent .