CURR11 — Modify and specify the behavior of the insertExchangeRate interface

Summary: The behavior of the insertExchangeRate() interface should be modified.
Since ExchangeRates will now have a window in time over which they are
effective, the behavior needs to address what happens when an exchange rate
is attempted to be inserted that overlaps (in time) an existing exchange
rate. i.e. Suppose an exchange rate exists in the system for a certain rate
type, source currency mnemonic, target currency mnemonic, and is effective
from 12:00 15 July 1998 until 12:30 15 July 1998. Now suppose we attempt to
insert an exchange rate for the same rate type, source/target currency
mnemonics and is effective from 11:45 15 July 1998 until 12:15 15 July
1998. How does the insertExchangeRate() interface react in this case, or in
any other case where the exchange rate to be inserted has an effective
window in time that in whole or in part overlaps existing exchange rate
data?

resolved by Currency 2 RTF