Incorrect currency postings

In IFS application the Inventory is valued in Accounting Currency. In the MPL voucher, M1 and M10 postings are created from the Accounting Currency.
When you create an Invoice in Different Currency other than Accounting currency and match with the Purchase Order Receipt, in the Cost Postings tab, for the variance postings M18,M19 and M20, the amount in transaction currency will be zero. But you can notice that the Accounting Currency has the correct values for M18,M19 and M20 variance postings. That is because the Inventory is valued in Accounting Currency. Then that will be reflected in the Voucher in General Ledger.

When you have a variance either between your PO price or standard cost (depending your inventory part setup), the variance in between this price/cost against the price you received from supplier invoice. This variance posting is also called PPV. These transactions are your internal assessment of your product cost / inventory value. Therefore it is not necessary to asses it in transaction currency. Either your invoice the same as company currency or foreign currency, these transactions will be created the invoice price is different to PO price or Standard cost as mention earlier. The transaction currency amount will always be zero.