...
In the Entity field, select an entity of your company for which this document is being prepared. The Entity field is available if the Multi-Company Accounting option is selected on: Administration > Settings> General Settings. You can select your personal default entity to appear in documents; for this, refer to Personal Settings. If you have not selected your default entity, the entity defined first will be used as the system default value.
...
A string below the Basis field (not displayed if Advance is the transaction type)—on the screenshot above, Basis Currency: AED—indicates the currency of the document selected as the basis. In case the basis document is not in the national currency, this string also shows the exchange rate of this currency with respect to the national currency, and then, on the Inventory and Services tab, the item and VAT amounts will be shown in both currencies. The exchange rate to be used for amount conversion must be equal to the rate published by the UAE Central Bank for the date of the supply. For details, see Currencies.
The document totals and other Information
...