X-Plant Material Status in MM - difference between ZB and Z5

Hello, All,

I'm working on our process to flag obselete master materials (R/3 4.6c), and haven't found a full description of the difference between X-plant status ZB and Z5. It appears that both will allow sales and warehouse management, but not procurement functionality - is there any functional difference in the two settings? Have searched the forums and Wiki with no luck yet.

Thanks much in advance.

-Dave