BUG: The system allows deleting all currency rates per currency

Hi all,

When you delete all currency exchange rates for a particular currency, the system reports an error message:

          "No currency rate associated for currency 187 for the given period"

where 187 is the ID of the currency.

The system expects at least one currency exchange line to exist, yet it allows deleting all of them.

This is a HUGE bug as it somehow block the users from validating invoices regardless whether the offending currency is used in them or not. Moreover, the users are blocked with the same error message from opening the offending currency record, and adding new exchange rate.

What the system should do is to either stop users from deleting all ex-rates thus leaving at least one, or allowing them to delete all rates but then pop up a meaningful message that will give clear instructions that they need to open this or that currency record and add rate.

Regards,
Danijel