Product_currency module not maintain prices in Vendor Bill/Customer Invoices

[MohsenWaleed]

Thanks for this helpful module. I noticed that when you create a vendor bill or customer invoices and add a product which has a product currency, the conversion of price is not working correctly.

Here you are how to reproduce the issue in vendor bill:
Company currency is YER

product name: Test
force Product currency is USD
standard price is 12.7 USD

Convertion rate is
USD = 500 YER

Then go to invoicing -> Vendor Bill and create a new Bill and leave the bill currency YER
once you you add Test product to the line, the price will be 12.7 YER and that's not correct and it should be 6350 YER

Try to create new Bill and currency equal to USD
once you you add Test product to the line, the price will be 6350 USD and that's not correct and it should be 12.7