If you want your dynamic transaction routing program to be invoked again when the routed transaction has completed, you must set the UE_Dyropter field in the parameter list to UE_Yes before returning control to CICS®, on the initial invocation of the user exit. You might want to do this, for example, if you are keeping a count of the number of transactions that are executing on a particular CICS system. However, during this reinvocation, the dynamic transaction routing program should update only its own resources.