Message appearing in Sale Order page

I deleted a company which was using INR as currency.Even after deletin the company and changing default currency in new Company created to AED ,Im getting message

Unable to find exchange rate for AED to INR for key date 2017-08-06. Please create a Currency Exchange record manually

How to remove it?

Your customer may be set up with default currency INR, or the Sales Order could be in INR. Please check and change the currency in the Sales Order to AED and you may not have this problem.

Hope that helps.