RDLC Report: Subtotal problem. Comment lines carrying / not carrying values from sales line (parent)

Hi,

I've got 2 reports which should be behaving the same. Can't find the difference.

I've got the sales confirmation and sales quote reports that should be behaving for the subtotal.

I have the subtotal field summing up a variable AmountExclVAT from the sales line dataitem and displaying that in the footer.

Problem is that on one of the report, the AmountExclVAT seems to be populated on the sales line comment so it will re-add the sales line amount by the number of comments that line has, therefore screwing the subtotal value.

I compared the NAV code and both are the same. Believe issue is from VS. Both got 2 levels of grouping + detail: sales header No. + Copy No., SL line no. and comment details.

Any idea?