Two kinds of exchange difference
A realised exchange difference arises when a foreign currency invoice or bill is settled at a different rate from the one used to record it. An unrealised difference arises when an open balance, such as a EUR payable at month-end, is retranslated at the closing rate as IAS 21 requires for monetary items.
Non-monetary items, such as inventory or fixed assets bought in a foreign currency, are not retranslated. Their AED cost is fixed at the rate on the transaction date.