Delivery costs

Hi

Value (Rs 100) entered at header level against condition type ZOB1 (Customs Value) in PO is splitting to items 1 & 2 propotionately based on net value of items as Rs 30 & Rs 70

While doing MIGO, It is posting values for line item 1 & 2, Rs 100 (NOT the Rs 30 & 70)

Local currency MXN & Vendor currency INR. Value entered at header in "X" MXN, and it is equivalent to 100 INR

Please help me, what are the possible reasons?

Thanks

Raju