Exchange rate diff.accts are not defined for account 1428907 currency USD

Hi

We are using Hana 1610 version i am facing this issue while clearing vendor open item in Company code currency USDbelow error occure.

Exchange rate diff.accts are not defined for account 1428907 currency USD

May i know why system giving exchange rate error for clearing Local currency USD to USD.Do i need to maintain setting in OB09 if yes please let me know the reason.

Thanks

M.Mohammed