We have a component of an assembly that we use 1.083 feet of (13 inches- it's stocked in feet).  When we go to close a work order for the item and backflush the materials, we get an error message that not all materials have been issued for the work order.
This is due to the fact that the backflush rounds the materials to 2 places past the decimal (1.08 vs 1.083).  If you use WO-G to issue the materials, then you can the full amount issued.  
It also appears that inventory transactions may be limited to 2 places as well (at least what is displayed in IN-A).