Finding historic periods of zero or negative inventory

SOLVED

I have been working on making reports for our purchasing staff who do not have a lot of experience with the yearly flux of our inventory  They have also been thrown off by the disruptions caused by COVID and the supply chain issues that accompanied it.  When they are determining purchase quantities, they look at the Inventory Management Item Maintenance or Inquiry and then the history tab.  They would like some of the info from that tab added to the custom crystal reports I make for them from the SQL Server linked database.  

When I look at that history tab, the information seems to be drawn from IM_ItemWhseHistoryByPeriod_bus

I find where I can draw the table by that name, but when I look at the fields, I do not have all the fields that show in the Item Maintenance screen.  BeginningBalQty or EndingBalQty are the ones they would really like to see in the reports.  

Are these fields calculated or stored somewhere else?  Is there a way to get them easily or do I need to make up formulas to calculate them?  

Thank you for any pointers,
Chris