Big Business 5.0.3 lifts the single-instance restriction on the Item Adjustment.
Previously, Big Business would allow only one user to open an Item Adjustment at one time. A user attempting to open an Item Adjustment, when another user was already in the Item Adjustment tool, would encounter an alert saying the Item Adjustment tool is already in use. (5901)
Big Business now allows multiple concurrent Item Adjustments. Contrary to the Server Setup Guide, the Item Adjustment is no longer a single-Instance tool. Multiple Users can create Item Adjustments at the same time, and using the new feature to open Multiple Instance of a Tool, one user can now open multiple Item Adjustments at one time.