Tsolanto, your installation is legal. The inspector is wrong. These are two seperate loads and per your discription you are in compliance with tap rules.
I don't have a clue as to how he could consider two sets of conductors going to different points could be paralleled.
If it would make him feel any better, you could scrap the 400 amp disconnect and use parallel lugs on the load side of the meter, or replace it with a gutter and simply splice 3\0 CU conductors to your 400 amp conductors here.
Given the location of these panels, this would be in compliance with articles 230 and 240.
[This message has been edited by Roger (edited 09-04-2002).]