DCPUCR sends negative answer although no answer shall be send (certification issue)

The PI certification tool "Profinet IO Tester" has a testcase DCPUCx where the behavior of the implemented statemachine DCPUCR is checked.

Depending on the timing of the PC it may (or may not) happen that the DCPUCR statemachine sends a negative response in a scenario where it shall not send a response according Profinet specification.