Hello Charles,
Sorry, I wasn't trying to be vague, but it really depends how you arrived at the 4 decimal place ACCPAC+. If you are using Softline's "Increased Decimal Place" product, then there may or may not be issues, depending on whether your primary interest was in the extra decimals of the costing or sales side of inventory control. Adagio does not handle the increased precision on the costing side.
If you just have a 4 decimal place home currency, then everything will be fine.
Why not download the evaluation, point it at a copy of your data and find out?
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Andrew Bates