Hi all
Apologies if this has been answered before but I can’t find it.

I have a main Report with a Group called “Product_Category” which lists a
number of “Products” in the Detail

I have a Subreport named “product_costs” which has a record for each date
and Text Boxes named “materials” and “fuel” (there are more but I’ll keep it
simple).
The Subreport sums all costs and has Text Boxes named “summaterials” and
“sumfuel” in the footer (all with a height of 0.1cm)
The Subreport is embedded in the Detail of the Categories and linked by
Product_id

In the Detail of the Main Report there are Text Boxes named “prodmaterials”
and “prodfuel” (all with a height of 0.1cm) which reference “summaterials”
and “sumfuel” in the Subreport footer.
Also in the Detail section, there is a Text Box named “sumprodcost” whose
Control Source is “=[prodmaterials]+[prodfuel]”. So far, so good – it all
works fine

I now want “Category” footer and the Report footer to sum “materials”,
“wages” and “fuel”. I would have thought the Control Source should be
“=sum([prodmaterials])”, etc. but it doesn’t work. Nor does
“=Sum([product_costs].[Report]![Summaterials]).
The Text Boxes are blank whatever I try. I do not get #Error

I have other Text Boxes relating to the “Product” in the Detail and summing
those in the Footer do work.

All cost Text Boxes are formatted as Fixed with zero Decimal Places
I suspect the problem might be that the Subreport is in the Detail rather
than Header or Footer. But it takes up less space the way I’m trying it.

What do I do to make it work?

I know I can do away with the subreport, link costs in the underlying query
and have an extra Group for Product and costs in the Detail. But, I would
rather not do that as it takes up more space on the Report