Do I have to use those "Z-" currency IDs in GP?

I know this seems like a trivia question, but recently I have come across a number of clients who have been using Microsoft Dynamics GP for a number of years and have been told by their former partners that they *must* use the predefined currency IDs created after adding the sample company, with no real explanation to support these claims. Case in point, my new client in Saudi Arabia, has been struggling for years to understand why they were told to prefix all currency IDs with the “Z-”.

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Do I have to use those "Z-" currency IDs in GP?