JPA Designer version 5.04a3 build 024 has been released which should resolve the problems with the SAP 9.81 calculations. There is no need to follow the work around given below.
This issue will be resolved in the next build of the program (5.04a3 build 024), but until that is released there is a work-around:
- Make sure you are running version 5.04a3 build 023: http://www.techlit.co.uk/downloads/jsetup990.exe
- Download the JPA_Designer.exe: http://www.silverleafsoftware.co.uk/JPA_Designer.exe
- Move that file into the JPA Designer folder, replacing the existing version of the file.
That should resolve the problem.