I converted a SO to WO using SO-N (as I usally do).  I printed the Pick List using WO-D.  Some items are showing up as only a tenth of the actual qty.  
 
Example:  Items show a qty of .04, when the correct qty on the STD BOM is 4.00.    
 
This happened only on (10) items on the BOM.  The items type = R, class = PS & PW.
 
I cancelled & purged the WO, and tried again with the same problem.