Why does the modification of client processing delay value disables the immediate transaction under IBM Rational Performance Tester (RPT)?
Immediate transaction getting disabled might lead to failure of the test script execution.
When you disable a request, you potentially invalidate some delays because in theory the disabled request could have been the basis for a delay. Therefore, RPT automatically recalculates the delays on the page when you disable a request. That is, if a later request used the disabled one as a base, the later delay request should be adjusted.