If you have a need to adjust your on-hand inventory working with AX7, you can leverage a few mechanisms to do this. One of these is the adjustment journal this will let you put inventory in or take it out of the system. Considering this you might not want to let everyone have access to it to avoid unnecessary mistaken adjustments.
Here is a quick overview.
AX7 Build 7.0.4230.16130
If you are working with AX2012 you can see an overview here.