Hi Sylvie;
PB versions 11.x and higher are correctly displaying the decimal 20,5 field. Its actually PB 7 that was defective. All PB applications need to use proper Display and Edit format masks to ensure a proper display of data. Allowing PB default to the [general] setting makes you susceptible to the whims of the O/S and/or PB release.
Note: That is why you can attach a Display or Edit format masks to your "data" in the DB Painter. Once set properly there ... all DWO's will use those defaults!
Regards ... Chris