Unable to select non-contract currency on Billing Events page (Oracle Fusion PPM)

Summary:

Our requirement is to select a different billing currency at the billing event (Amount based contract) level rather than using the contract currency. Currently, changing the billing currency on the contract only changes the invoice currency; however, for amount-based contracts, we need to change the event currency itself to meet our requirements. At present, the billing currency field at the event level is disabled for amount-based contracts.

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