locked EH on Event reporting

Dear All,

                 We have standard OTC RDS implemented , where there is one EH for SO. On EH creation we have an event for Billing creation and we have added one more for accunting document (custom dev of BTE) .

                   Both the events are triggered on save of billing document , one for billing event and other for FI event.

                   The issue is , the events are locking each other. Sometimes one is reported and sometimes other. In this case what should we do ?

Thanks,

Shubh.