OPEN_DOM_AMOUNT currency rate in report - CUST_AGE_ANALYSIS_REP

Hello, 
I think in general open item in AP/AR is stored at its historical rate, and currency difference is calculated and booked at each payment, in case of partial one leaving open value in accounting currency following open amount in transactional currency at original currency rate. 

Perhaps it may change if transactional-level revaluation is executed without reversal, I have never used this option.