Hi Eva,
What are you trying to do with 4 decimals in the amounts?
Note that changing the currency to use 4 decimals will affect every amount field related to dollars, not just specific fields. And once a company data set is created, you cannot change it to use a new currency code (or decimals that come with the code). And only Multi-currency enabled companies can use a number of decimals other than 2 - provided that you start from scratch when creating the company data.
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Regards,
Softrak Tech Support