Exchange rate error

" Uncaught (in promise) Error: Exchange Rate is mandatory. Maybe Currency Exchange record is not created for AED to INR "
even though company and customer have currency INR , I’m getting this error. the Global default currency is AED. Can’t identify the cause

Remove global default currency.
System will automatically fetch company currency and your problem will solve.

its mandatory field, if it changed will it effect the work flow?

Possibly related to this thread

A fix has released in v13.54.2

Simillar thread

Check that you are using the correct company if you have multiple companies. ie, if you have company A and B. If your current session is of company A, then ensure that the sales order is for company A and not B.