Hi,
I see the issue, you have created the exchange rate at a ratio of 1:1. You need to have the rate for the currency code you are setting up to 1 or 100 depending on how you want to calculate the rates. You need to define the calculation of: 1 AED = 0.272253 USD.

This is my setup for reference, my base currency is EUR, this defines exchange rates against the USD, so the "exchange rate" = USD and Relational Exchange Rate = EUR (blank) and AED.

Additional notes:
1. The adjust exchange rates won't work because there is nothing to adjust (no difference between AED and USD).
2. If AED is your base currency it is not necessary to have a currency setup for AED because a "blank" currency code = your base currency in BC.
I hope that helps, let me know how you get on
Regards,
Martin