Currency Conversion User Defined Attribute for Mapping Set Approvals

Summary:

I want to use a user defined attribute that converts all currencies to GBP currency in the mapping set for approvals.

Content (please ensure you mask any confidential information):

Question - How do you specify ledger currency value for foreign currency requisitions on the new mapping set functionality?

EDIT: I think the issue is fixed. So if a requisition is entered in a foreign currency, the AMOUNT field seems to hold the amount in the ledger currency which gives me what I want. (i.e the amount of the line in the currency of the buying company). I will need to test further that this behaviour is consistent but I believe this field is designed to hold the line amount in the ledger currency.