Only one benchmark at a time may reference a component, as described in "Exclusivity in benchmark participants".. If a component is required in multiple benchmarks then each benchmark must be created, performed, and then deleted before the next one may go through the same process.
To delete a benchmark, in the IBM System Manager, right click on the benchmark that you want to delete, under Integration Component Libraries -> Samples_ICL -> Benchmark. Select Delete from the list of options, and then click OK to confirm the deletion.