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Currency customization in Expense claim

We have a number of projects going on in our organization, and this has demanded us to create separate accounts (bank account) with different currencies (e.g TZS, USD, EURO). The same has forced to have multi-currency in ERPNExt system.
We managed to create one chart of account which is Multi-currency as well. We assigned USD as default currency. So when one wants to submit expense claim, on the item “Claimed amount” and Sanctioned amount", the USD comes as default account.
Is it possible to customize a slot of “currency” so that when one claims whatever, then he/she can choose which currency is the claimed amount belong? I have struggled along but haven’t succeeded to solve this problem as of now

Any success in adding currency options in HR expense claim?