yes, if time_entry_form is null or empty then i want this key to be true. the negation with ! works on other values and it seems it is the true and false expressions which are not translating well. I'll give this variation a try though!
And interestingly, when i run this through post man the use of plain old 'false' (without quotes of course) works. I think its the conversion of this boolean into text by retool. maybe I am incorrectly using Form Data as my body type (i use the same in postman though)