Oracle Fusion Cash Mgt External transactions will allow reference number multiple times

In our instance we have external transactions getting created from an external source through OIC. In the source ssytem the reference number can be reused in different period's and years. So when they are sending the same reference number when it is getting interfaced to fusion, we are getting error same reference number is already there. So how to accept same reference number multiple times when the dates and amounts and other fields are not same.

What setups to be cross checked to accept the same reference multiple times and the impact of it.