So far it has been possible to specify per company code a maximum exchange rate deviation in percent for postings in foreign currency. With Release 3.0A it is now also possible to specify a maximum exchange rate deviation per foreign currency, i.e. a maximum deviation in the rate of exchange between foreign currency and local currency in percent.
You do not need to define a maximum exchange rate deviation specifically for foreign currency/local currency unless it differs from the one defined for the company code.
To define a maximum deviation in the exchange rate between foreign currency and local currency, refer to the "Define maximum permissible exch.rate difference per for.curr" step in the "Financial accounting global settings" Implementation Guide.
You also maintain the maximum exchange rate deviation per company code via the "Financial accounting global settings" Implementation Guide in the "Define maximum permissible exch.rate difference per comp.cde" step.