You are right! SAP delivered this table as per ISO standard. If you have transactions posted in your system and then you make changes in OY04, the amounts stored in tables are interpreted using the changed settings in OY04. For example, JPY 1000 is interpreted as JPY 1.000 once you change OY04 to specify 3 decimals for JPY currency. This has to be done carefully - for the changes to be consistent, you also have to change the corresponding amount fields for that currency - which is quite complicated exercise. Please refer to the foll. SAP Note!
OK, what confused me was the use of the word "dollar" in your post - that is why I asked for numbers. Looks like this is not a conversion related query. For JPY, standard is 0 decimal places on T-Code OY04, not OB90. 0 decimal places is ISO standard I guess for JPY and that is how SAP delivered table TCURX (the view you get in T-Code OY04). Changes to this table could cause serious inconsistencies in the data.
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