Fixtures and pipes ( and other fixtures) not lining up on Y axis

Question

I am seeing an issue with various elements not lining up in the Y dimension. 
 For example - I have a pipe at Y dimension of 3' 4" and a fixture at 3' and the fixture shows further upstage than the pope. 
 
 I notices for the Fixture the 'World' value is the same as the 'Y' value 
 For the pipe these values are different ( Pipe is at Position 3' 4" - World at 2' 3.0376" ) 
 For grins I tried to set the world value to 3' 4" but then I did that, it also changed the Position value. 
 
 What is the intent of 'world' suggestions for fixing?

Thanks

starksk · Answer

It appears you have the pipe nested within something in the second example. When it is nested, the world value should show the pipe's real world location relative to the model origin while the position shows its position relative to the origin of the object it is nested. When it is not nested, the world value and the position will match as both are relative to the model origin. (As is the case in your fixture example) 
 Nested devices retain their world position when nested to a parent and the offset is calculated. If you wanted both to be at the same Y value, you would want to have the position of the pipe at the same world Y as the fixture prior to nesting or adjust the Y position to account for the offset of its parent object after nesting the pipe.

Fixtures and pipes ( and other fixtures) not lining up on Y axis

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