Lord only knows and as operating pilots we all know its a load of rubbish.
All that some inspectors are interested in is that the Plog is complete and there is something in everybox. The fact that whats in the box is blatantly useless and as the previous poster said N/A is neither here nor there.
A number in the box is all they are looking for, if it relates in someway to one of the approaches at the airport even better.