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Valid layers vs. normal layers using SKILL

ToMWUT
I’ve got a problem with lpps on my layout. When I’m trying to display them using cv~>lpps and then lpps~>layerName and lpps~>purpose I get one result. But when on the other hand I’m displaying all valid layers due to technology file of my project I’m unable to get those lpps which I obtained using first approach. What am I doing wrong? I put my SKILL code below:
 
foreach(lpps cv~>lpps
            printf( "Name:  %s purpose %s \n",  lpps~>layerName,    lpps~>purpose)             
            );foreach
valid=leGetValidLayerList(techGetTechFile(cv))
println("Valid Layers:")
foreach(lpps valid
            printf( "Name:  %s purpose %s \n",  car(lpps),    cadr(lpps))                       
            );foreach
 
Does it mean that layers used in my layout aren’t valid layers due to technology file? What’s the difference between a valid layer and a normal layer?
Some additional information: I’m talking about a layout which I obtained after the extraction process – it’s quite obvious that I would not be able to draw those layers using some editing tool, because they are not valid… or am I wrong?
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