Assets security issue

Hi,

 

I'm trying to define the access security for Fixed Assets. In Oracle's user manual, the security is defined by book, which is related to an asset organization. Therefore I need to define an organization for my company holding and their subsidiaries and assign a different asset book for each one. The problem with this option is that I can't transfer assets between books, and a common operation in this company is transfer assets between subsidiaries and their holding. 

 

Is there another option to define my security in Assets? The goal is restrict the assets view between users (my subsidiary users must view only their assets)