Not calculating most records
I am new to FM, so this might be a really simple problem, but I cannot figure it out. I have created a calculation field called "Margin." It has the calculation (SellingPrice - Cost) / SellingPrice. On maybe 10% of my records, it returns a proper value, but on all others is displays "?". Any thoughts? In all the records the SellingPrice is greater than the Cost and both fields have values.