AP Invoice approval rules should be evaluated based on USD currency.

Summary: AP Invoice approval rules should be evaluated based on USD currency. Business requirement is like, There are 15 Business units across the geographies and each one has its own Ledger currency for example India Business Unit has INR, Sri Lanka Business Unit has LKR as functional currency so on so forth, and Business want all the AP invoice approval rules should work on based on USD currency for all the Business units. How can we achieve this. I have tried with Rule evaluation currency attribute in SRC but that is not working.

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