Check the Specification box if you want to make specifications on an account. A specification is an additional text, registered on a transaction row, and visible in the Print Journal/Print General Ledger etc.
This alternative can be used when coding foreign currencies. If you activate Specification for the bank account in the chart of accounts then the currency code for the payment being made will be placed in the spec-field in the coding and accounting. This will clarify which currency that the transaction concerns.
If you activate Specification, the Currency field will also be activated under Settings. There you can select to link a currency to the account. However, the currency must be registered in the Currencies procedure in the Global Settings module. You link a currency if the coding on the account always shall be made in that currency. When a currency has been linked, a warning appears if the coding on the account is made in another currency.