format rule inline table

I am trying to format my inline table. I am trying to use a isblank rule. When I save a form there is an empty weight in net weight. But customers are able to go back and input an net weight. I want the inline table to change the rows that have net weights to a different color. So hence why I thought a isblank would work on my net weights but it reads it as a 0 almost. Any ideas?

ISBLANK() will return true or false. A screenshot would help to explain “but it reads it as a 0 almost”.

I figured it out I added a column in my table that reads my net weight as blank or not. set my format rule to net weights= False