f1l$###,###.##number f2c$###,###.##number background-color:#c0c0c0;width:100px;f3r([entry.f1] + [entry.f2])read_only !f1:[empty] AND !f2:[empty]f3=([entry.f1] + [entry.f2])Set expressionf1 !f1:[empty] AND !f2:[empty]f3=([entry.f1] + [entry.f2])Set expressionf2 | 