Calculate Screen as seen in SpApp.
The calculations are limited to the normal arithmetical operations. But they do a fantastic job for all of us in business systems. A complex operation make your thinking very involved and beats the SpApp’s objective of keeping it simple.
SpApp thinks the way you think. It gets a documentation of your logic in the SpecGuide. Put in as much of business logic, as you need. However, do ensure that your logic is in the right sequence. Do remember, SpApp is your 'Logic Calculator'. You set the logic & SpApp follows it. Hence, the sequencing of your logic is very vital. For example, you want to arrive at the Net Value of the invoice, you should have calculated the basic values, taxes etc before working at the Net Value. This is simple to understand. However, deploy caution when you change logic.