Where in the PDF file are the AcroForm calculated fields stored??

Question

I have been able to copy computed text fields from one document to another. They are displayed in the "Text Field Properties" dialog of the target document, but they do no perform the prescribed sum. I am obvioulsy doing a partial copy.
To be sure, I am referring to the "Value is the sum (+) of the following fields" attribute.
TIA,
-Ramon

Answer 1

Simplified field notation:
Limited description in Acrobat help.
Calculate tab for form field properties
Some things I have found:
Filed name must start with an alphabetic character
Spaces or dots in name must be preceded by JS escape character
Only simple arithmetic operations allowed
No flow control
No properties
No methods
No functions
Parenthesis control order of operations
Can enter numeric constants
Can not use dates or times in calculations
This feature works by using JS to parse the entered string and process the field values and constants.
How to do (not so simple) form calculations by Thom Parker