MIGO Base Value.

Dear Expert

Please help me on below scenario.

My client is raising PO. The Material cost is 100 INR. While goods receipting, Knowing that material cost is 120 INR.

So i am changing the Base value 100 to 120 INR in detail data (Excise item) tab while doing in MIGO.

After posting the MIGO (Accounting entries) showing as per PO Value. It is not showing as per MIGO Base Value.

Please help me. How i resolve this issue?