I had something similar and it was because the denominator was a zero
before the user entered the variables. It was fixed with an
"if/then/endif".It looks like the problem in yours is form1 being zero.
Tryif([YOUR DENOMINATOR]>0)then[YOUR FORMULA
HERE]endifExample:if(form1>0)then(this.rawValue=form1.#subform[0].NumericField4.rawValue
/ form1.#subform[0].NumericField5.rawValue)endifYour formula is a bit
more complicated than I can decipher, so I'm not sure how much after the
"/" you need to inclu...