Could mean one of 2 things:
1) The pipe does not have part of it raised above the point where it joins your house drainage plumbing, so there is a potential risk of other household waste water finding its way by gravity into the dishwasher.
Or 2) The pipe fits into a standpipe but is not fitted with a U shaper former to maintain the bend in the pipe. If such a former is not used there is a risk that the waste hose will jump out of the standpipe and flood the building.
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