FAS 2008 is supported with MAS 90 4.30. Did you upgrade FAS incrementally...e.g. 2001, 2002, 2003...? Or did you just install FAS v2008 on top of the 2001 version?
I would recommend calling FAS Technical Support for assistance with this. If you are a MAS business partner without a FAS customer number, please call MAS Technical Support and ask to be transferred to FAS Technical Support.