What could happen if my PDA currencies do not match up with my FDA currencies?

Is it absolutely necessary for users to ensure that the Invoice Amount and Amount Base currencies in PDA invoices match with the FDA.

For example, say that a user is creating Port Disbursement invoices, where the PDA’s Invoice Amount is reported in NOK and its Amount Base is reported in USD. If the user creates a FDA invoice where only USD is used for both Invoice Amount and Amount Base currencies, then the user runs the risk of these two fields mismatching after PDA adjustments have been made to the FDA due to VIP’s inherent rounding logic. The system could then present users attempting to post the mismatched invoice with the following error message, preventing Saving and Posting: