Getting started

So I am 100% clear, the full amount of RPP (employee + employer = box 52) can be used as a tax shelter (like an RRSP), correct?
If that is correct, I am a little confused with your first sentence where you state "which has no effect on your actual tax refund or tax payable". Does this mean that TurboTax does not use the value of box 52 automatically in the software or are you saying that box 52 can not be used as part f the RPP tax shelter reduction?