Add to or Remove Products from Stock
            
                - Open the Product View screen and goto the Stock tab
 
                - Tap the + button and select 'Add to Stock' or 'Remove from Stock'
 
                - Enter the quantity, confirm the date and eventually add a note
 
            
            Note that the 
initial Stock value is 
0. Use the Add to function to initialize the stock quantity for a Product.
            The 
History of stock additions and removals is displayed in the Stock tab, and the 
Current Stock value is computed from the history of stock entries.