As 4D is transitioning its language towards dot notation, any expressions involving decimals will soon need to require a leading 0 to prevent conflicts with dot notation syntax. For example, take the expression below:

EXECUTE FORMULA("$result:=1+.5")

should be changed to:

EXECUTE FORMULA("$result:=1+0.5")

Make sure to take the time to add the leading zero to any decimal expressions prior to converting to v18.