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I realize that this is 4+ years later but in case someone else runs across this issue, I figured it by combining sonya1's "another solution" with some javascript I have for ghost text to come up with this that works for me:
if (this.isNull) {
app.alert("This is a required field!");
xfa.host.setFocus(this);
}
ENSURE THAT LANGUAGE IS SET TO JAVASCRIPT AND NOT FORMCALC!