Why is my camo cover missing? ATI HD4000 rendering issues DX9

With an NVIDIA GeForce GTX 275 graphics card installed with Forceware Release 185.65 drivers you can see a tent cover, or military camo mesh netting for those that like to get technical. When you load up the same scene on the AMD Radeon HD 4890 or any Radeon HD 4000 series card for that matter, you have the wire frame for the covering, but no mesh netting. After some further research from the community it and on the test bench it appears that when running Enhanced Full Dynamic Lighting that the camo mesh is present on NVIDIA GeForce GTX 200 series graphics cards, but not on ATI Radeon 4000 series graphics cards. If the setting is changed to Enhanced Full Dynamic Lighting (DX10) on the ATI Radeon HD 4000 series of cards the camo mesh appears after the game is restarted. This is still interesting as it means that benchmarking ATI versus NVIDIA with the 'Enhanced Full Dynamic Lighting' setting doesn't matter much as the cards will be rendering different objects in various parts of the game and this could impact the frame rate as the render path is not identical.