This is an issue I've had with both a Purchase Order and a Sales Quote Layout.
The majority of fields are working but I can't seem to pull through any data for any of the totals. I've even added all of the 'Total' fields to a text box to see whether I've just used the wrong field but it has returned a blank.
Here is a screenshot of the RDLC file:

But then when I import it into BC and run a report, this is all I'm getting:

So as you can see, the TotalNetAmount, TotalVATAmount and TotalAmountInclVAT fields in the table aren't returning any data, neither are all the fields I'd added to the textbox to the left.
Can anybody shed any light on why this may be?