Thank you, I should have caught that. K

Hi Niall,Thank you for your reply.I tried this:var vResult = Qty1.rawValue - Qty2.rawValueif (vResult <= 0){this.rawValue= "0"; //or = "Error" or whatever you want}else{this.rawValue= vResult; }and I am getting a script error on the first {Qty1 and Qty2 are the field names for ObjectA and Object B.K

Is there a way to restrict a number field to a positive value?For example; a-b=c where both a and b have to be positive numbers and c cannot be less than 0.K

Opps, I forgot the .I did try this and it worked to keep all calculation in my total, but now when I add instance, I get an error message. I did email you a sample of my form with an explaination of my issue, before I added the .rawValue.Thank you. K

Yes setup-tr2 is a field name. So my expression should look like xfa.resolveNode("#subform[1].setup-tr2")rawValue+xfa.resolveNode("#subform[1].mid-tr2")rawValue+ ?

xfa.resolveNode("#subform[1].setup-tr2")+xfa.resolveNode("#subform[1].mid-tr2")+ it goes on from here.Its targeted for reader 9.0 or later.

I have a form where I have a total calculation field. When I add an instance in the form everything below that instance is no longer calculated. Please help.K

Ok, I got it, this is what I needed Sum(location[*].yes900[*].admids[*].midtr3a[*]).Thanks K

Hi Srini,Thanks for the response. I still cannot get this to work when I add an instance, it works for the first one, then I get an error message.Thanks K

I am trying to get  fields  from  add instance/subform fields to calculate with the rest of the form fields. The problem I am having is once I "add instance" the field is no longer part of the calculation. I have tried using:// Verify at least one instance of the midtr3a field exists.if (exists(loca...