Joined: 22 Nov 2005 Posts: 700 Location: Troy, Michigan USA
Without knowing exactly what your input values are it's difficult to tell you exactly why you're getting the results you are. The results appear to contradict each other in formatting.
However, I think your question is why you 10 ? 90 = 80? The problem is that the result field is defined as a non signed field. The result is the Absolute (positive) vale for the number. Define the result field as S9(4). Your results will be different.