How to calculate and update value of the field2 based on what user enters i

I have a field1 (date type) in page1, while saving this value to the table, I also need to update other field (field2) based on field1 on the same table. (for ex. field2 is 60 days greater than field1).
Also on next page I want to display field2 as read only (grayed out)...
I tried to display value of field2 on next page using "ITEM" of page1, but that is not what I need..
While proccesing page1 I need to calculate and save value of field2, and then on next page display it from the table (not from previous page's item)
Could you please either help or point me to the document that has a similar example?
Thank you very much.

how are you updating the row..
if its using the commit button then have an actionlistener and then derive and assign the value to the particular column of the row..
      DCIteratorBinding dciter;
      BindingContainer bindings = BindingContext.getCurrent().getCurrentBindingsEntry();
      dciter = (DCIteratorBinding) bindings.get("lineItemIterator");
        dciter.getCurrentRow().setAttribute("column4", value);

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