Multiple currency in one Bank Account

Hi 

Need experts advice on the issue. Please help as soon as possible.

We have a vendor who have bank account created in local currency. In Qatar, the banks allows USD dollars to be transfered to Qatari riyal accounts.
The invoice was raised by the vendor in USD and Payment was issued in USD. But there was no output from Wire transfer format since there is no bank account with USD in the system.
So my question is, if we want to trasnfer USD to Qatari Riyal account, can we created another bank account in the system, with the same account number given by the vendot and currency as USD? I tried this scenario and it worked fine. So is it a correct solution or is there any other solution?