Forex Exchange Tolerance Limit

Dear Experts,

Can you please let me know, where I can see the option for Forex exchange tolerance?

I can see tolerance for clearing but not for Forex exchange.

Requirement-

As exchange rates changing on daily basis so we need tolerance limit for that forex.

Example - Today we created customer invoice at exchange rate of 1 Dollar = 63.5 Rupees. Now when customer is paying the amount then on that day rate is 1 Dollar = 63.3 Rupees.

So the difference in exchange rate is 0.2 only, which is minor. So we are looking for tolerance limit which should apply to such cases.

Thanks & Regards,

Sujeet Kumar