Decimal/Rounding Calculation Definition

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General

Every decimal shall have a precision
The precision of the result of an operation is depended of the precision of the operands

Question to answer

How does an operation effects the precision?
When should be rounded? During calculation? At presentation of the value at the GUI?
How do we handle error propagation? Should we divide as late as possible? (Each number is internally a fraction of two numbers)

Which calculations are done from the business side?

Reference

see: https://sourceforge.net/apps/mediawiki/openpetraorg/index.php?title=Multiple_Currencies

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