The internal warn symbol prodiuces a problem when used in conjunction with the BITMAP statement. We are working on an update of the platform to fix this issue. In the meantime, I recommend you design your own warning sign in the "IF (_mandatoryerr)" statement.
Please find attached a sample implementation as an ABL library.
1IF (_mandatoryerr) {
2 FILL color: yellow
3 PEN w:3pt join:round
4 POLYGON 3 x1:-1.25cm y1:0.5cm x2:-0.25cm y2:0.5cm x3:-0.75cm y3:-0.4cm
5 FONT h:20pt bold
6 TEXT "!" x:-0.85cm y:-0.2cm
7}