AR exchange

We are in 9.1. release. We dont have multicurrency. We book our AR invoices with our international customers in usd in jde although the customers pay us based on spot rate based on invoice dates. This creates huge amount of exchange gain or loss that we need to adjust our AR receipt. We created new AR deduction and set up RA** aai for this. Now, since the amount is high, we have to reset our Mnl write off limit in processing option of receipt to higher amount. Since this also opens up possibility to take higher amount of deduction on