How to sync same iPhone using 2 different iTune libraries...

I have been trying to figure out how to sync my iPhone 4S to 2 different libraries.
The reason is that I have one library whichhas all my Apps, Books etc. that I keep on one external drive and the other just music as I take that other external drive to dj. As I get new music every day, I sync this to my iPhone so I can get to hear it when I am out.
I tried to open up one library to sync my Apps and books, then switch libraries by reopening iTunes just to sync music.
However it won't allow me as everytime I switch, say I synced the music first, upon opening up the Apps and Books library, it deletes my music (even when I don't have music synced - I am guessing it reads as wiping my music)
Is there a workaround to this?
I am using Lion.
Thanks

Thanks Carolyn for your advice.
Was a bit sad to read that I cannot do that, but I still tested it out. To my surprise, I have managed to find out by testing and testing that (thankfully) iTunes does let me sync with one device with 2 libraries.
As long as the music and books are synced on one library, and apps on the 2nd Library I was able to split the libraries up to two different external drives with their respective iTunes library folders.
It would have been perfect if I could just split the Music by itself as I didn't want the books on the same drive but I am happy nevertheless.
The only bad thing is that the syncing was tested on my iPhone and not my iPad which I don't need music... so I had to add dubplicate books in the library for the iPad with just Apps for my iPhone. Now I have to test whether it will sync my bookmarks between devices for the same books.

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Hi, thanks for your answer.
Unfortunately this does not work because iTunes still keeps one account with the store active regardless which library I open. So when I switch the account in the store it will be switched for both libraries. That means that I can not separate the iPhone applications and all the other specific sync parameters.
I thought about using my wife's account on the Mac and pointing iTunes to the new library - the problem here is that then the iPhoto library is not accessible any more......
I can't really believe that there is no solution from Apple - I mean there must be more couples and families out there with 2 and more iPhones syncing with one iTunes / iPhoto etc libraries.
Any other ideas? Thanks in advance!

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How to sync same iPhone using 2 different iTune libraries...

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