Shrinkwrap takes parts away from assembly

[nier07]

So I´ve searched forums and can´t find the answer. When creating a shrinkwrap some parts go missing and it seems to be different each time I do this after working a bit more on the assembly.

I´m making a model containing the piping, one guy is constructing the house and another draws the electrics. None of the others need my model for connections or anything, so I thought it would be best to keep it small. But as mentioned, it doesn´t work properly.

Sure, they can use it anyway but it looks bad to have gaps in the piping....

BTW I tried installing Inventor Simplification but it will not show up in any of the menues at all. In the windows control panel it says it´s installed.

Any idea on what I´m doing wrong?

[nier07]

Second pic, after shrink, shows the same piping, but another lod. My mistake.

But You can see the pipes above the three valves is gone anyway. And the flanges.