One Operating Unit With Multiple Asset Books

Hi Guys,

I am having a trouble with the mass addition create for our clients assets.

I have one operating unit with two assets books. When I create the AP Invoices and run the mass addition create for "Asset Book A" the program brings through even assets that have been allocated to "Asset Book B"  same happens when I run mass addition create for "Asset Book B"  the program brings through additions that have been allocated to "Asset Book A".

Am I missing something in the setup? Is this a security issue? This also happens when I mark the Invoice line with "Track As Asset" and allocated the relevant asset books at invoice line level. If I run mass addition create fro "Asset Book A" it brings in all and same applies the other way around.