I would like to ask, why in Odoo8 the new constraint _check_main_currency_rounding behaves now different than in Version 7.

What kind of sense is this? In Version 7 the Decimal Accuracy could == the Main Currency rounding. In Version 8 the Decimal Accuracy has to be higher than the Main Currency Rounding. Is there any reason for this new kind of behaviour?

Greets from the baltic sea