This option will be set in the Standards Module (StandardsFileMaint./File/System Settings/Inventory).
A Finished Goods order differs from a typical printing order in that an additional step must be taken to deduct items from the Finished Goods Inventory. This may be accomplished by clicking the "Deduct" button, on the "Shipping" screen. If the “Don’t Deduct Finished Goods Inventory in Shipping” option is selected, the "Deduct" button will be disabled.