Scenery object missing

For some time now I find that every so often when I am flying FS2002 ususally flying the superb PIC B767, (also happens when flying other 2002 a/c too) that I get a strange message that a scenery object is missing. When I check the ID number and cross reference it to the Aircraft directory the same message appears when I select the Mooney Bravo, which is there !Ive put up with this for three years ! Is there any way round this usless piece of info, I couldnt really care whether it is there or not. Ive tried re-installing 2002, but it doesnt make any difference.Many thanks.Best Wishes,ChrisEGBB