You have entered a zero in a field that should remain blank. Right-click on that zero on the Smart Worksheet. then click on the little popsicle that comes up to the side to go to the source.
Once you right-click, if no popsicle comes up, you can click on Data Source from the drop down list. A box should come up telling you where the zero came from with a blue underlined link you can click to get to the source.
