How do joined Pathology depts of separate hospital trusts manage to integrate their incident reporting systems and risk registers for full visibility?

If an incident potentially affects all of Pathology- then in which trust should this be reported- or do you report in each thereby duplicating everything, and slowly losing the will to live?

If the incident is only reported at one site- then there is potential for problems to be overlooked at the others. It would be very helpful to know how other sites have managed this aspect of the JVs and mergers.