SAP Process Of Imported Material With Excise

What are the procurement cycle (stepwise) of imported material up to GR(101)? What are the steps that are to be followed to reverse the GR for imported material? What are the transaction used?

1) The procedure for imported material receipt is as follows.....

a) P.O. Generation for the material. ME21n
b) Capture planned delivery cost MIRO
c) Capture excise invoice J1IEX
d) Goods Receipt MIGO

Since we are capturing the planned delivery cost for the GR (through MIRO) . So before returning the material we have to reverse the planned delivery cost thru "Subsequent Credit " using MIRO. Then only return thru MIGO will be possible.

So, the steps for cancelling the documents for imported material is:
2) a) Sub sequent credit using MIRO
b) Return GR (delivery) using MIGO
c) Cancell the excise invoice using J1IEX

These are the steps to return the imported material & cancel the Excise Invoice capture