Can you help us by describing what the application is showing / what its for?
Is this a General Ledger Journal/detail?
A Inventory Transactions Inquiry?
It looks like possible a custom application to me.
Whatever screen you are in, go to the top menu and select databroswer
That will tell you the view it's using, then check XREF for views and tables. also do an Item Help or F1 to get the field you are interest in