How Credit Limits works in Oracle Receivables?

As we can maintain credit limits based on currency wise would like to know how it works.

Example: For a customer we have defined the credit limits as below,

Note- Ledger Currency is AED

Credit Limit 1:

Currency : AED

Limit: 100,000

Credit Limit 2:

Currency: USD

Limit: 20000

1. Now when there is a transaction of AED 120000, will it takes both the limits into consideration or only the AED Limit?

2. What if there is GBP Transaction? Will it refer to AED Limit as the base currency of the ledger is AED?

3. Only USD transactions are subject to USD Limit?

Regards

Uday