How to set conditions based on spreadsheet cell

Hi,

I have a spreadsheet where I am calculating a value. I have a cell which calculates total of all column cells. I want to have a condition, if it is greater than 300; form should not be submitted or some error message

Unfortunately, it's not currently possible to set up conditions based on certain cells of the Spreadsheet widget, if you want, we could forward this as feature request, although we cannot provide an ETA or ensure this will be implemented, we would keep you updated via this thread. 

Let us know.